Dogs live with us, watch us, and often reflect our lives back at us. When routines shift, they shift. When stress builds, they sense it. 



Scientists wanted to know just how much these changes affect <a href="https://www.earth.com/news/national-puppy-day-2025-where-happiness-meets-responsibility/">dogs</a>, particularly during the upheaval of the pandemic. That curiosity led to one of the largest studies ever on canine behavior.



<h2 class="wp-block-heading" id="h-tracking-dog-behavior-and-health">Tracking dog behavior and health</h2>



Researchers at Virginia Tech and the <a href="https://www.washington.edu" target="_blank" rel="noreferrer noopener">University of Washington</a> studied over 47,000 dogs between 2020 and 2023. 



The work was conducted as part of the Dog Aging Project, a massive effort that tracks the lives and health of dogs across the United States.



"Most importantly, with these data, we're excited to now have a starting point from which we can continue to follow changes in the behaviors of tens of thousands of <a href="https://www.earth.com/news/dogs-may-respond-to-each-other-through-blinking/">dogs</a> as they age, which will ultimately help us understand how behavior and health are linked," said Courtney Sexton, lead researcher from Virginia Tech.



<h2 class="wp-block-heading" id="h-detecting-changes-in-dogs">Detecting changes in dogs</h2>



Behavior in <a href="https://www.earth.com/news/dogs-suffer-from-the-january-blues-just-like-humans/">dogs</a> is more than personality. A sudden change can point to illness, pain, or stress. Small shifts in aggression, fear, or trainability can signal bigger problems. 



By establishing a baseline, researchers now have a way to spot meaningful changes across time. 



The team relied on a widely used survey known as C-BARQ, in which owners reported on 14 aspects of their dogs’ behavior - from aggression to trainability. 



Researchers then organized these traits into four broad categories: Fear, Attention and Excitability, Aggression, and Trainability. This framework allowed them to track and compare behavior patterns over time.



<h2 class="wp-block-heading" id="h-strength-of-the-data">Strength of the data</h2>



The dataset was huge. It included dogs from every region of the United States. Nearly half of the dogs were mixed breeds, while the rest were single breeds. Ages ranged from puppies to seniors.



"When you have a data set this big, you really do have power in numbers," Sexton explained. "While we can't understand all the factors, when we find statistical significance, there is likely something there worth thinking about in its real-world context."



<h2 class="wp-block-heading" id="h-dog-behavior-during-the-pandemic">Dog behavior during the pandemic </h2>



The original goal was clear. Researchers wanted to see how the pandemic shaped dog behavior. People spent more time at home. Many adopted new pets, and social interactions declined.



Routines changed overnight. Did <a href="https://www.earth.com/news/dogs-are-evolving-to-fit-the-modern-lives-of-humans/">dogs</a> change too? Scientists hoped to uncover whether these new conditions led to lasting behavioral shifts, from training challenges to changes in aggression or fear. They wanted to know if dogs adapted or struggled alongside humans.



The data showed that dogs remained surprisingly consistent from 2020 through 2023. "We saw that certain factors, such as a dog's life stage, sex, and size had some influence on their behavior," Sexton said.



"Interestingly, we found that throughout the COVID-19 pandemic time period, there were not substantial changes in dogs' overall behavioral profiles from year to year despite what we might have expected given the changes in environment and routines that many were experiencing at that time."



<h2 class="wp-block-heading" id="h-pandemic-puppy-struggles">Pandemic puppy struggles</h2>



One behavior did shift: trainability. Dogs enrolled in 2020 scored higher than those added in later years. Scores dropped in 2021, 2022, and 2023. 



Researchers think the dip reflects “pandemic puppy” struggles. New owners often lacked time or access to training. Dogs had fewer chances to socialize. Stress in households added to the mix.



By 2023, trainability scores started to climb back toward earlier levels. That rebound suggests that as people regained stable routines, dogs did too.



<h2 class="wp-block-heading" id="h-the-role-of-gender-breed-and-size">The role of gender, breed, and size</h2>



The study also revealed differences tied to breed and body size. Mixed-breed dogs scored higher on fear, attention-seeking, and aggression than purebred dogs. Shelter backgrounds and early trauma may play a role.



Small dogs were more fearful, more aggressive, and less trainable than larger dogs. 



Puppies needed more attention, were less fearful and less aggressive, but also harder to train. Males were more aggressive and less trainable than females.



<h2 class="wp-block-heading" id="h-dogs-and-owners-bounced-back">Dogs and owners bounced back</h2>



Owners in 2020 reported more aggression than those in 2023. That drop may reflect less household stress and more opportunities for dogs to interact as restrictions lifted.



“What was interesting was that the difference in reported trainability between the first year and the last year was the smallest of any in the averages,” Sexton noted. 



“It’s a small statistical significance but could show that dogs, or their owners, are bouncing back.”



<h2 class="wp-block-heading" id="h-future-research-on-dog-behavior">Future research on dog behavior</h2>



This is only the beginning. <a href="https://dogagingproject.org" target="_blank" rel="noreferrer noopener">The Dog Aging Project</a> will keep tracking these dogs as they grow older. Researchers want to see how location, health, and age shape behavior over time. 



The ultimate goal is to connect behavior with health so owners can better care for their pets.



Dogs adapted through the pandemic. They struggled in some ways, especially with training, but showed remarkable resilience. Their story mirrors ours. 



As life changed, dogs adjusted, and as routines returned, they found steadier ground. This study now offers the first large-scale baseline of canine behavior - a reference point that will guide both researchers and dog owners for years to come.



The study is published in the journal <a href="https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0330257" target="_blank" rel="noreferrer noopener">PLOS One</a>.



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How the pandemic changed dog behavior over 3 years

Dogs live with us, watch us, and often reflect our lives back at us. When routines shift, they shift. When stress builds, they sense it. Scientists wanted to know just how much these changes affect dogs, particularly during the upheaval of the pandemic. That curiosity led to one of the largest studies ever on canine behavior. Tracking dog behavior and health Researchers at Virginia Tech and the University of Washington studied over 47,000 dogs between 2020 and 2023. The work was conducted as part of the Dog...

A decade-long project set out to understand what life was like during the Triassic period all around the world. 

The Triassic period, 252 to 199 million years ago, followed a great mass extinction and saw the arrival of the earliest mammals and reptiles. These terrestrial species lived on <a href="https://www.earth.com/news/largest-mass-extinction-coal/">Pangea</a>, an early supercontinent where all the world’s land masses were connected. 

Researchers led by geologists from the <a href="https://www.washington.edu/">University of Washington</a> wanted to find out what kind of evidence of the mass extinction and the Triassic could be found in other geographic regions. Their findings were released in a collection of articles published in Society of Vertebrate Paleontology.

“Most of what we know about the major mass extinction is from the South African Karoo Basin. I was always interested in understanding, do we see the exact same pattern around the world, or do we not?” Said Christian Sidor, a UW Biology Professor and curator of Vertebrate Paleontology at the <a href="http://www.burkemuseum.org/">Burke Museum of Natural History and Culture. </a>

The project resulted in the discovery of exciting new fossils and ecological breakthroughs.

A new lizard-like species called a procolophonid and an early dinosaur called a Teleocrater were both discovered as a result of new fieldwork. 

Sidor and a team of paleontologists visited the Ruhuhu Basin of Tanzania five times and the Luangwa and mid-Zambezi basins of Zambia four times since 2007. 

The researchers collected fossils and examined museum specimens in order to fill in the gaps about Triassic life in different regions around the world.

The researchers were primarily looking for similarities in the fossil record across varied locations. 

“These papers highlight what a regional perspective we now have -- we have the same fossils from Tanzania, Antarctica, Namibia and more,” said Sidor. “We're getting a much better Southern Hemisphere perspective of what's going on in the Triassic.”

The fieldwork, studies, and articles also help explain how dinosaurs grew to be such a dominant group of reptiles. 

“This was a time when dinosaurs were just stepping onto the stage, and they were not very big and not very remarkable animals then,” said Sidor. “These papers really round out what dinosaurs were competing with before they became the dominant reptiles on land.”

--

By <a href="mailto:kayvandette@gmail.com">Kay Vandette</a>, <a href="https://www.earth.com/">Earth.com</a> Staff Writer

Image Credit: Christian Sidor/<a href="https://www.washington.edu/">University of Washington</a>

Piecing together what life was like during the Triassic Period

A decade-long project set out to understand what life was...

Even though sea turtles have flippers for the purpose of guiding their movement, a new study has revealed that they also use their flippers to handle prey.

The researchers found that this behavior, which was thought to be unlikely in marine tetrapods, is very widespread. Furthermore, <a href="https://www.earth.com/news/climate-change-sea-turtles/">sea turtles</a> may have begun co-opting their flippers as far back as 70 million years ago.

Study co-author Dr. Kyle Van Houtan is the Director of Science at <a href="http://www.montereybayaquarium.org/">Monterey Bay Aquarium</a>.

“Sea turtles don't have a developed frontal cortex, independent articulating digits or any social learning,” said Dr. Van Houtan.”And yet here we have them ‘licking their fingers’ just like a kid who does have all those tools. It shows an important aspect of evolution - that opportunities can shape adaptations.”

The research team used crowd-sourced photographs and videos to search for various ways that sea turtles use their limbs. While this type of behavior has been discovered in other marine mammals such as walruses, it not been previously documented in sea turtles. 

The study revealed that sea turtles use their flippers for a variety of foraging tasks. The scientists found many informative images, including a loggerhead rolling a scallop on the floor of the ocean and a green turtle holding a jelly.

“Sea turtles' limbs have evolved mostly for locomotion, not for manipulating prey,” said lead author Jessica Fujii. “But that they're doing it anyway suggests that, even if it's not the most efficient or effective way, it's better than not using them at all."

The experts were surprised to find that sea turtles were co-opting their flippers, primarily due to the fact that they are considered to have simple brains and simple flippers. It raises the question of whether marine mammals are learning new behaviors through observation.

“We expect these things to happen with a highly intelligent, adaptive social animal,” said Dr. Van Houtan. “With sea turtles, it's different; they never meet their parents. They're never trained to forage by their mom. It's amazing that they're figuring out how to do this without any apprenticing, and with flippers that aren't well adapted for these tasks.”

The study is published in the journal <a href="https://peerj.com/">PeerJ</a>.

--

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer
Image Copyright Fujii et al. shared under Creative Commons CC BY

Sea turtles use their flippers as hands to eat food

Even though sea turtles have flippers for the purpose of...

Biologists at the <a href="https://www.ucdavis.edu/">University of California, Davis</a> are reporting that 90 percent of the world's coastal freshwater turtles will struggle with <a href="https://www.earth.com/news/sea-level-rise-displace/">rising sea levels</a> by the end of this century. 

The research represents the first comprehensive global study of freshwater turtles that are commonly found in water that is slightly salty, or brackish.

“About 30 percent of coastal freshwater species have been found or reported in a slightly saltwater environment,” said lead author Mickey Agha. “But they tend to live within a low-level range of salinity. If sea level rise increases salinity, we don't yet know if they'll be able to adapt or shift their range.”


The majority of turtle species live in freshwater environments such as lakes, streams, and ponds. While some turtles can tolerate high levels of salinity, others tend to lose body mass in salty water and can die as a result of exposure.

The study was first focused on pond turtles in the semi-salty waters of Suisun Marsh in northern California. The team established that the turtles faced threats of drought, water diversions, and increased sea level rise - all of which can result in saltier habitats - with climate change. 

The biologists broadened their scope to examine how other coastal freshwater turtles around the world may be affected as well. 

The biggest threat to freshwater turtles was found on the island of New Guinea, where many species will lose over 20 percent of their habitat range with sea level rise. The other species that were found to be the most at risk are in Southeast Asia, Australia, and southeastern North America.

The findings of the study highlight the need for further research to investigate whether freshwater turtles will be able to adjust to their rapidly changing habitats.

“If we've underestimated the impact of sea level rise along coastlines, we don't yet know whether these turtles can adapt or shift fast enough to move with the changing salinity, or whether that part of its range will be gone forever,” said Agha.

Professor Brian Todd added: “This is a species that is slow to evolve. If we rely on natural selection to sustain them, they will likely disappear.”

The study is published in the journal <a href="https://onlinelibrary.wiley.com/journal/1469185x">Biological Reviews</a>.

--

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Image Credit: Todd Stailey/Tennessee Aquarium

Freshwater turtles across the planet threatened by sea level rise

Biologists at the University of California, Davis are reporting that...

“Congress finds and declares that wild free-roaming <a href="https://www.earth.com/news/domesticating-wild-horses-genome/">horses</a> and burros are living symbols of the historic and pioneer spirit of the West; that they contribute to the diversity of life forms within the Nation and enrich the lives of the American people; and that these horses and burros are fast disappearing from the American scene.” 

– from the Wild Free Roaming Horses and Burro Act signed into law by Richard Nixon in 1971

According to a February 2017 <a href="https://www.nationalgeographic.com/">National Geographic</a> piece, there are more than 70,000 wild horses living in the western United States.  The <a href="https://www.blm.gov/">Bureau of Land Management</a> has a mandate that they’re clearly failing to keep the wild horse population at 23,622.  

Horses evolved in North America, crossed land bridges into Asia and Europe, and then 10,000 to 12,000 years ago they went extinct in North America.  Wild horses were introduced to the American landscape from domestic animals from Europe. Mostly the Spanish lost or released horses. Sometimes someone died in a remote area leaving a horse, sometimes a person had more horses than could be handled and some were released.  Slowly, horses showed their knack at living, thriving and expanding their population in the inhospitable, arid American landscape they were dropped into in the 1500’s.

I’ve been on a hike in the Book Cliffs of western Colorado, a cliffy range of mesas named for their similarity of appearance to enormous stacks of books.  Indeed, the book cliffs lie open to the eyes of geologists, as one of the best places to study the sequence stratigraphy; that is layers of time laid down through erosion and deposition.  

The Book Cliffs are a rare instance of a mountain range going east and west rather than north and south in North America.  At about two thousand feet the Book Cliffs make up the tallest continuous escarpment of cliffs/mountains in the world. The area is semi-arid with scraggly juniper, cactus, yucca and the occasional piñon pine providing scarce sustenance.  This is a great place to see wild horses. 

On a short hike through decaying sedimentary cliffs and rough, scrabbly gravel and unsteady dirt, we heard a snort behind us.  Turning we saw a small group of horses moving quietly over the hill and grazing peacefully, keeping a wary eye on me and my girlfriend.  We watched the horses through binoculars; saw a small baby skittish and full of energy jumping around the flanks of adults watchful and strong.  I’ve seen wild horses before and since, mostly in the Book Cliffs, I’ve also seen wild burros in Northern Arizona in Grand Canyon-Parashant National Monument.  Seeing horses or burros in the American landscape, it’s hard to escape the feeling that they are part of the fabric of the place. In Twilight of the Mammoths, paleontologist Paul S. Martin confronts directly wild horses in the American landscape, 

“The genus Equus remains highly variable, with many species in the Americas, until near time.  The explosive spread of free-ranging horses into grasslands of both North and South America following their reintroduction by the Spanish suggests a return of the native.”

Horses did evolve in North America; they are, or at least were, a part of the natural rangeland ecology of North America a mere eye blink ago in terms of geological history.  The problem has to do with numbers. An ever growing population of horses means that land is stripped of grass, bushes and other wild forage to be found. A large amount of wild horses perhaps means greater competition for resources like food and water with wild animals like pronghorns, mule deer, bison and bighorn sheep.  The problem is even more greatly exasperated by the presence of cattle and sheep on public lands, which outnumber wild horses. Something has to give and it seems unlikely that ranchers or wildlife advocates will give land to wild horses, so how to keep horses and burros from destroying the land? 

Hunting is how wild animals, mainly deer, are kept at population limits set by government management agencies.  It’s a bit hard to convince hunters they want to eat horse sausage or mount a mustang head on their den wall. Hunting horses seems even less palatable to the general non-hunting population.  Horses are more companion animal in public opinion than they are a wild animal open to the cruel laws of predation. Hunting is of course how prey numbers are kept in check in a healthy natural ecosystem.  The Keystone Predator Hypothesis helps shed light on the whole issue of hunting as management tool and the utility of predation. Predators tend to focus on prey species that are easy to find and abundant. When a prey species abundance drops off, generally another prey species that competes with the first for food and other ‘resources’ becomes more abundant.  The predator tends to refocus predation on the new, now more abundant prey species. In this way, all prey species are pruned back, allowing several species that vie for the same resource to live in the same area. Predators in turn are kept at a certain population level due to the amount of prey species available. 

Without predation or some other population control measure, disaster ensues.  The Kaibab deer population of Arizona is a classic example. 

The Kaibab deer are a unique population of Mule Deer that the government wanted to protect.  In 1906, Theodore Roosevelt set aside the Grand Canyon Game Preserve, partly to protect Kaibab Deer.  In the early days of wildlife management, the federal government apparently made an egregious mistake.  All known predators of the deer in the area where killed mercilessly in an attempted eradication. Mountain lions and wolves were shot.  Hunting by humans was strictly regulated. The deer quickly grew in numbers without predators curtailing their numbers. As the deer population ballooned, grass, shrubs, even tree bark was consumed, soon the deer were emaciated, hungry and dying.  Disease increased in the overpopulated deer. The population of Kaibab Deer that had grown so expansively crashed even faster. Exact data on the deer are hard to find and other factors complicate the picture. Cattle and sheep were removed from the Kaibab Plateau at the same time predators were eradicated.  What we do know is that the population of Kaibab Deer did increase to a much larger number than before and subsequently crashed. Whether it was due to the foolishness of predator control or natural cycles, the starvation, illness and crash in deer population was clearly linked to an unsustainable deer population growth.     

The danger we face with wild horses is the same danger that we faced with the Kaibab Deer. The fear is the horse population will continue to grow unchecked, leaving the western United States barren of natural vegetation, severely damaged and littered with the bloated, rotting corpses of horses.  Of course it’s not just the fate of horses and burros that’s at stake, the problem also affects the deer, bison and other wild animals. The problem of wild horses also affects ranchers dependent on the federal subsidy of public land for their living.

The BLM has a limited budget and there has been an effort to control wild horse and burro numbers.  Wild horses and burros are regularly put up for adoption and this is one of the least controversial measures for population control.  The problem is that according to a nationalgeographic.com article, as of March 1 2016, there were 45,000 horses and burros in governmental holding pens, theoretically waiting to be adopted.  Adoption rates fall far short of population growth of horses and burros. 

According to an article in <a href="http://www.sciencemag.org/">Science</a>, the population increase of horses and burros means that by 2030, the government will have to spend $1.1 billion to feed and water the animals in holding pens.  A new horse birth control in the form of a yearly injection in mares has also been attempted. The BLM has injected 4,562 mares since 2005 according to theweek.com but there has yet to be an appreciable decline in horse populations.  Euthanasia for un-adopted wild horses and burros is so unpopular that Ben Masters received death threats for voting for it. Ben Masters himself was also an advocate for adopting horses, personally adopting several. 

There are no USDA approved processing plants for horse meat in the US, the most likely solution being that any hunted or otherwise killed horses to be used for human or animal food would be sent to Mexico for processing.   

It’s hard to deny that with a larger presence of mountain lions, wolves, black and brown bears throughout their traditional range in the west, populations of horses would be different.  All of these animals are capable of killing at least sick, young or injured horses and together possibly maintaining a healthy horse population. As anyone familiar with the ecological history of the west knows, these predators were hit hard by extermination efforts bolstered by the federal and state governments and largely haven’t recovered.

The decline of predators in the American west is inexorably linked with the ascendance of cattle and sheep.  Eradicating predators was always popular with American cattlemen who found wild predators a threat to their livestock.  According to the BLM, they manage livestock grazing on 155 million acres of their land. The Forest Service also manages some land for grazing, including so called wilderness areas but I couldn’t find solid numbers on how much land they allow for grazing.  An analysis by the Center for Biological Diversity carried out in 2015 showed that grazing on public lands costs US taxpayers $1 Billion over the last ten years. Wolves, mountain lions and other predators are still contentious in the few places they survive in the west and part of the problem is political pressure from ranchers subsidized on public land.  

Horses are just one more aspect complicating the western landscape and caught in the crossfire of a fight over who controls the land and the heart of the west.  Horses like other immigrants have carved out a place in the United States but unlike some have a longer history, one only broken briefly. With a wilder west, a west without millions of public cows and more predators, we might be able to find a place for horses.  We might even be able to find a place for wild horses that didn’t involve mass slaughter. 

--

By <a href="mailto:zachfitzner@yahoo.com">Zach Fitzner</a>, <a href="http://earth.com">Earth.com</a> Staff Writer

Wild horses caught in the crossfire of the western U.S.

“Congress finds and declares that wild free-roaming horses and burros...

<a href="https://www.earth.com/news/north-atlantic-right-whales/">North Atlantic right whales</a> may now be more critically endangered than ever before. Experts who have been monitoring the whales off the coast of Florida and Georgia are reporting that no right whale babies have been born this year. 

Aerial surveys are conducted each year to spot new calves as they emerge off the coast of the southeastern United States. Now, as the winter calving season comes to a close, it looks like this could be the first year with no offspring since the observations began in 1989.

The North Atlantic right whale has been listed as endangered since 1970. There are an estimated 450 right whales remaining, and just under 100 of them are reproductively mature females. 

There is growing concern that these females may not reproduce quickly enough or live long enough to save the species. The whales face major threats from human activities including ship strikes and entanglement in commercial fishing gear. 

According to the <a href="http://www.noaa.gov/">National Oceanic and Atmospheric Administration</a> (NOAA), at least 17 right whales died in 2017 off the coast of Canada and the United States.

Philip Hamilton is an expert at the <a href="https://www.neaq.org/">New England Aquarium</a> who has been studying the right whales for three decades.

“It is truly alarming,” Hamilton said of this year's winter calving season. “Following a year of such high mortality, it's clear the population can't sustain that trajectory.”

Even if the whales are not killed by entanglement or ship strikes, scientists say that the stress associated with ship noise and the trauma from entanglement may be causing the right whales to reproduce less often. In addition, the females may not be getting enough food to sustain a healthy pregnancy.

Over the past 30 years, right whales have averaged around 17 births per year. However, most calving seasons since 2012 have resulted in a below-average number of births. 

Researchers will continue to look for newborn calves as the right whales return to their feeding grounds off the coast of the northeastern United States.

“It's a pivotal moment for right whales,” said Barb Zoodsma of the <a href="https://www.fisheries.noaa.gov/welcome">National Marine Fisheries Service</a>. “If we don't get serious and figure this out, it very well could be the beginning of the end.”

--

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Endangered North Atlantic right whales didn’t reproduce this year

North Atlantic right whales may now be more critically endangered...

A new study from the <a href="https://www.nmbu.no/en">Norwegian University of Life Sciences </a>has revealed that human activities have altered the natural behavior of the Scandinavian brown bear. Hunting pressure has not only changed the way a mother cares for her cubs, but has also changed how often she reproduces.

“Generally, the cubs have followed their mother for a year and a half,” said co-author Professor Jon Swenson. “Only rarely have we observed them to follow her for two and a half years.”

Compared to 15 years ago, many more cubs now stay with their mothers for an additional year. “Man is now an evolutionary force in the lives of the bears,” said Professor Swenson.

Norwegian and Swedish researchers have been closely tracking the Scandinavian brown bear since 1984. Professor Swenson has been involved with the research since almost the very beginning.

“The Scandinavian brown bear project is one of the world's two longest research projects on bears,” he explained. “We have followed over five hundred bears, many from birth to death.”

Since the project was launched, the number of bears shot and killed in Sweden has been on a steady rise. Between 2010 and 2014, approximately 300 bears were killed by Swedish <a href="https://www.earth.com/news/ancient-alaskan-hunters-advanced/">hunters</a> every year. 

The number of female bears keeping their cubs around for an additional year increased from 7 to 36 percent between 2005 and 2015. 

Most countries that allow bear hunting prohibit the killing of families. By keeping her cubs around her, the mother bear has a better chance of survival.

“A single female in Sweden is four times more likely to be shot as one with a cub,” said Professor Swenson.


On the other hand, females who keep their cubs until they are two and a half reproduce less often.

“In an evolutionary perspective, this would not be beneficial,” said Professor Swenson. “The animals with the most offspring ‘win’ nature's race.”

However, the results of the study revealed that the longer lives of females balanced out a lower birth rate, particularly in areas with high hunting pressure.

The study is published in the journal <a href="https://www.nature.com/ncomms/">Nature Communications </a>.

--

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Hunting pressure has changed how bears raise their young

A new study from the Norwegian University of Life Sciences...

With billions of arthropods on the Earth at any given time, Arthropoda is the single most successful phylum on the planet. Researchers at the <a href="https://www.wisc.edu/">University of Wisconsin-Madison</a> have discovered that one class of arthropods, common spiders and their relatives, has adopted an interesting strategy which may help explain the evolutionary success of arachnids.

Arthropods are characterized by protective exoskeletons, paired jointed appendages, and segmented bodies. These adaptable parts are likely the reason that arthropods are well-suited to life on every corner of the planet.

Scientists Emily Setton and Prashant Sharma have now demonstrated that the common house <a href="https://www.earth.com/news/arachnids-spiders-scorpions/">spider</a> has gotten rid of a gene involved in creating segmented heads, and have delegated this responsibility to the genes that form segmented legs.

The team found that a pair of genes known as Sp6-9 and Dll, which are normally involved in signaling to an embryo where to grow legs, has been co-opted by some arachnids to signal where the head should be built as well. These arachnids lack the gene which guides proper head segmentation in other arthropods called Sp5. 

“This is the plot twist that gives away the story,” said Sharma. He explained that scientists will now be able to track the evolutionary history of the insects which have ditched the gene Sp5. “It's a very arachnid-specific loss,” added Setton.

The research team stumbled upon this interesting event in the genetic history of arachnids while investigating the genes that dictate the formation of spinnerets. They set out to determine whether these silk-spinning organs are modified legs, and began analyzing various genes that guide leg development in spiders.

When Setton knocked out leg development genes in arachnid embryos, she was surprised to discover that their head segments disappeared as well.

It is common for a single gene to dictate different functions across species. For example, the gene that codes for jaw bones in reptiles also codes for ear bones in humans. It now appears that spiders, scorpions, and two other animals examined by Setton and Sharma have done this with Sp6-9 and Dll.

The findings of this research will help biologists trace the evolutionary history of one of the most abundant groups of animals on the planet.

The study is published in the <a href="http://www.pnas.org/">Proceedings of the National Academy of Sciences</a>.

--

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Spiders recycle the gene that forms their legs to make their head

With billions of arthropods on the Earth at any given...

Scientists in Kenya have found fossil evidence that <a href="https://www.earth.com/news/lion-africa-still-threatened/">lions</a> were once much more terrifying than they are today. Skull remains have revealed that lions which resided in east Africa 200,000 years ago were enormous creatures that stood as tall as humans.

An international team of researchers from the <a href="http://www.museums.or.ke/">National Museums of Kenya</a>, the <a href="https://www.utah.edu/">University of Utah</a> and the <a href="https://www.uark.edu/">University of Arkansas</a> uncovered the partial skull fossil at a site in Natodomeri, northwest Kenya.

“This skull is the first indication of the existence of a population of giant lions in the late Middle and Late Pleistocene of eastern Africa, perhaps occasioned by the presence of greater megafaunal biomass than today,” wrote the study authors.

The experts analyzed the fossilized teeth and skull to calculate the size of the lion. They found that the newly discovered species had an average height of 5 feet 6 inches.

“The skull is remarkable for its very great size, equivalent to the largest cave lions of Pleistocene Eurasia and much larger than any previously known lion from Africa, living or fossil,” said the researchers.

[caption id="attachment_1171287" align="aligncenter" width="633"]<a href="https://www.earth.com/wp-content/uploads/2018/03/lions.png"><img class="wp-image-1171287 size-full" src="https://www.earth.com/wp-content/uploads/2018/03/lions.png" alt="" width="633" height="602" /></a> Image Credit: Journal of Paleontology/Manthi et all 2017[/caption]

The scientists speculate that the lions grew to be massive in size by living on a diet of large plant-eating mammals.

“The image of the lion is pervasive in human culture from its earliest preserved expression in Palaeolithic art to more modern cultural references like Disney's the Lion King,” said the researchers. “In the scientific world lions are also a focus for attention.”


The experts said that this new insight “raises questions regarding the extent of our understanding of the pattern and causes of lion evolution in the Late Pleistocene.”

The study is published in the <a href="https://www.cambridge.org/core/journals/journal-of-paleontology">Journal of Paleontology</a>.

--

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Newly discovered ancient lions were as tall as humans

Scientists in Kenya have found fossil evidence that lions were...

Research examining the environmental impacts of logging are crucial for implementing regulations and conservation measures in order to prevent population loss and habitat degradation. 

The effects of the logging industry on large species such as jaguars can be particularly devastating.

The loss of habitat and <a href="https://www.earth.com/news/land-partnerships-protect-biodiversity/">biodiversity</a> is becoming a serious concern among conservationists, which is why some countries have implemented reduced impact logging operations as a means to help protect certain species. 

A new study reviewing these well-managed logging concessions in Peru and Guatemala found that jaguars do well if policies are put in place to strictly regulate logging areas. 

The study was conducted by researchers from <a href="http://www.sandiegozooglobal.org/">San Diego Zoo Global,</a> <a href="https://bronxzoo.com/">The Bronx Zoo Wildlife Conservation Society,</a> and the <a href="https://www.serfor.gob.pe/">Servicio Nacional Forestal y de Fauna Silvestre</a> in Lima, Peru. 

The results, published in the online journal Biological Conservation, are hopeful and suggest that logging operations and conservation are not mutually exclusive.

“Our findings indicate that certified logging operations can play an important role in maintaining vital habitat for jaguars and other large wildlife species,” said Mathias W. Tobler, the lead author of the study.

For the study, the researchers set up large-scale camera trap surveys that would record and monitor the number of jaguars in certain logging concession areas in Guatemala and Peru. 

The cameras captured 23 jaguars Guatemala's Maya Biosphere Reserve and 43 jaguars in Peru's Madre de Dios region. Jaguars have unique spot patterns, so the researchers were able to accurately calculate the individuals in an area without fear of counting the same jaguar twice. 

The number of individual jaguars in the different areas were then used to create spatial capture-recapture models that calculated the total jaguar densities, or the estimated number of jaguars in the protected regions. 

In Guatemala, the researchers estimated that there 1.5 jaguars per 100 square kilometers and in Peru the density was 4.5 per 100 square kilometers. 

The team also found that strictly controlled logging roads, previously thought a hindrance to certain species, was helpful for the jaguars to move through the area. 

All in the all the results show that well managed logging operations with a goal of protection and conservation are successful in maintaining biodiversity. 

“Controlling access into an area and hunting of prey are paramount considerations for the objectives of preserving biodiversity and ecological function, both of which are selling points for certified lumber products,” said John Polisar, a co-author of the study. “The presence of jaguars in a logging concession is testimony that environmental guidelines are being followed.”

--

By <a href="mailto:kayvandette@gmail.com">Kay Vandette</a>, <a href="https://www.earth.com/">Earth.com</a> Staff Writer

Logging and conservation efforts can successfully coexist

Research examining the environmental impacts of logging are crucial for...

How did <a href="https://www.earth.com/news/north-atlantic-right-whales/">whales</a> evolve to be some of the largest animals on Earth? 

Previous research has hypothesized that the expansive nature of the world's oceans allowed for more flexibility in how large a species developed its body size. The simple concept equated more space with more room to grow.  

However, researchers from <a href="https://www.stanford.edu/">Stanford University</a> found that this was not the case, and that marine mammals are actually more constrained in their size than land animals. 

The results, published in the journal Proceedings of the National Academy of Sciences, show that size is dependant on ancestry, energy and food availability more than anything else.

“Many people have viewed going into the water as more freeing for mammals, but what we're seeing is that it's actually more constraining,” said Jonathan Payne, a co-author of the study. “It's not that water allows you to be a big mammal, it's that you have to be a big mammal in water - you don't have any other options.”

For the study, the researchers collected data on body mass for 3,850 living and 2,999 fossil mammal species. The data included records of extinct species as well as living ones. 

The researchers examined the compiled data and created models in order to understand how mammals that came to live in water grew to their standard sizes. 

Although whales, seals, and other marine mammals share similar characteristics, they don’t share a common ancestry. For example, seals and sea lions are related to dogs while whales and dolphins are related to hippos. 

It would seem that as soon as a species began to live in the water, it evolved to its new size relatively quickly. 

The researchers suggest that for aquatic mammals, their larger size helps them retain heat which is important for conserving energy. The size of an aquatic mammal then becomes dependent on its energy needs. 

“Basically, animals are machines that require energy to operate. This need for energy places hard limits on what animals can do and how big they can be," said Craig R. McClain, a fellow co-author of the work. 

The researchers are working to expand their understanding of animal size distribution to other species other than aquatic mammals and hope that their work will help explain the many variations in size for animals from different classes of species. 

“The hope is there are simpler explanations that can apply to other species, including terrestrial animals,” Payne said. “It opens up some possibility that body size can be explained by basic principles of physics and chemistry.”

--

By<a href="mailto:kayvandette@gmail.com"> Kay Vandette</a>, <a href="https://www.earth.com/">Earth.com</a> Staff Writer

How whales grew to become the largest mammals on Earth

How did whales evolve to be some of the largest...

A study led by the <a href="https://www.santafe.edu/">Santa Fe Institute</a> is the first of its kind to use drones to track the movement of individual animals within a group. The investigation, which was focused on migrating caribou, revealed a surprising amount of variation across animals within the herd.

The research team captured video footage of <a href="https://www.earth.com/news/caribou-hunting-restrictions/">caribou</a> during migration using drones. Their objective was to study the movement and social interactions among the caribou as they traveled between mainland Canada and Victoria Island. 

The researchers extracted trajectories of each individual caribou from the images, and used these path projections to examine how fine-scale movement patterns were influenced.

“New technologies, like the drones and computer vision we used in our study, are really exciting because they give us the ability to collect movement data on every single individual in a group simultaneously,” said lead author Andrew Berdahl. “That means we can now unravel the important role that social interactions play in guiding migratory movements.”


Prior to the recent emergence of drone technology, scientists relied on GPS collars to track migrating individuals. This did not give the researchers any insight into the social dynamics of a group.

The study revealed that individuals within a herd do not all behave similarly, which is a common assumption.


“We found enormous variation in sociality across sexes and age classes,” said Berdahl. “For instance, calves are highly social while adult bulls tend to be much more independent.

The researchers also found that the caribou were more influenced by members of the herd that were in front of them than those traveling beside of them.

“This leads to asymmetric information flow through the herd and, interestingly, agrees with the traditional knowledge of the Inuit, which states that a subset of 'lead' caribou effectively guide the path of the annual migration,” explained Berdahl.

“Ultimately, collective behavior is important because social dynamics can have population-level implications,” wrote the study authors. 

The approach used in this research could be applied to future studies to explore individual and collective movement in a wide variety of animals in different surroundings.

The study is published in the journal <a href="http://rstb.royalsocietypublishing.org/">Philosophical Transactions of the Royal Society B</a>.

--

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Image Credit: Jeff Turner

Drone study reveals unique behavior in animal groups

A study led by the Santa Fe Institute is the...

Researchers at the <a href="http://www.ufl.edu/">University of Florida</a> have found that dogs do not always prefer the company of their owners over strangers. The findings of the study suggest that, when dogs are relaxed, they are more interested in making new friends.

Experts have previously reported that <a href="https://www.earth.com/news/therapy-dogs-college-students/">dogs</a> are more comfortable with new people after three ten-minute encounters. In the current study, researchers found that it only takes ten minutes of interaction for a dog to warm up to a new person.

The research team observed dogs during ten-minute sessions as they chose to be petted by their owners or by strangers in various settings. 

The study authors explained that the experiment was intended “to test whether owned dogs would prefer their owner over a stranger and whether the familiarity of the testing context would influence preference.”

The study revealed that, when dogs were in an unfamiliar place or were feeling anxious, they stuck with their owners 80 percent of the time. On the other hand, dogs who were relaxed and in a familiar setting spent up to 70 percent of the session giving their attention to strangers.

“Owned dogs preferred to interact with their owners when in an unfamiliar context, but allocated more time to the stranger in a familiar context,” wrote the study authors.

Study lead author Erica Feuerbacher is currently an assistant professor of Companion Animal Behavior and Welfare at Virginia Tech. 

She explained that it is reasonable to assume that the presence of the owner and the comfort of a familiar place made the dogs feel safe enough to approach strangers. In an unfamiliar setting however, the owner is still the “dog's number one,” said Feuerbacher.

The study is published in the <a href="https://onlinelibrary.wiley.com/journal/19383711">Journal of the Experimental Analysis of Behaviour</a>.

--

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Dogs are more likely to befriend a stranger when they are relaxed

Researchers at the University of Florida have found that dogs...

<figure class="wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio"><div class="wp-block-embed__wrapper">
https://www.youtube.com/watch?v=3Y4eLFNYrKE
</div></figure>



On the unforgiving landscape of North Greenland, temperatures drop and sunlight barely penetrates through the polar winter. It was here, however, that an international team of scientists found <a href="https://www.earth.com/news/predatory-worms-were-terror-beasts-half-a-billion-years-ago/#google_vignette" target="_blank" rel="noreferrer noopener">evidence of sea monsters</a> that would change our understanding of ocean life in the past.



This video captures the discovery of Timorebestia fossils that had been hidden for more than 500 million years in the Sirius Passet formation. The "terror beasts," as they are called, are a hidden chapter in the evolutionary history of <a href="https://www.earth.com" target="_blank" rel="noreferrer noopener">Earth</a>, showing that sophisticated predator-prey interactions occurred much earlier than previously envisioned.



Dr. Jakob Vinther and his research team at the <a href="https://www.bristol.ac.uk/" target="_blank" rel="noreferrer noopener">University of Bristol</a>, in collaboration with researchers at the <a href="https://eng.kopri.re.kr/" target="_blank" rel="noreferrer noopener">Korean Polar Research Institute</a>, braved extreme weather conditions at 82.5 north latitude to locate these giant creatures. Using sophisticated electron microprobe analysis, they revealed the detailed anatomy of the animals, including their muscle and nerve tissues.



The find upsets the traditional timeline of sea predators. Although we've long appreciated that Cambrian oceans were at one time ruled by <a href="https://www.youtube.com/watch?v=jWI3-UgA3_o&amp;list=PL1QLQMW9MWDwpkFOnvgAmu7wT6rZmYqdJ&amp;index=19" target="_blank" rel="noreferrer noopener">arthropods</a>, these discoveries indicate that relatives of arrow worms were first to dominate the seas. These worms were building sophisticated food webs several million years before other predator groups arose.



Each fossil is a story of ancient hunger, with fossil stomach contents revealing these meter-long beasts dined on heavily armored arthropods regularly, cementing their place as the ocean's first apex predators.



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Worms dominated seas before dinosaurs

https://www.youtube.com/watch?v=3Y4eLFNYrKE On the unforgiving landscape of North Greenland, temperatures drop...

<figure class="wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio"><div class="wp-block-embed__wrapper">
https://www.youtube.com/watch?v=Ow3JH03PqEQ
</div><figcaption class="wp-element-caption">New York is the site of the world's oldest forest.</figcaption></figure>



<h2 class="wp-block-heading" id="h-385-million-year-old-trees-discovered">385-million-year-old trees discovered</h2>



Scientists have uncovered something extraordinary just two hours north of New York City. The <a href="https://www.earth.com/news/worlds-oldest-forest-discovered-close-to-new-york-city/" target="_blank" rel="noreferrer noopener">world's oldest forest</a>, dating back 385 million years, offers a window into how Earth's first complex forests shaped our planet's atmosphere.



Located near <a href="https://townofcairo.com/" target="_blank" rel="noreferrer noopener">Cairo, New York</a>, in Greene County, these weren't merely primitive plants struggling to survive. These were sophisticated trees with root systems remarkably similar to modern forests. This ancient woodland predates dinosaurs by 140 million years.



<h2 class="wp-block-heading" id="h-the-cairo-forest-discovery">The Cairo forest discovery</h2>



385 million years ago, upstate New York was a tropical paradise near the equator. Thanks to continental drift, this ancient forest has traveled thousands of miles to its current location.



The fossil forest sits in an abandoned quarry, roughly half the size of a football field. This represents just a slice of what was likely a massive forest system stretching from New York into Pennsylvania.



Charles Ver Straeten, curator of sedimentary rocks at the <a href="https://www.nysm.nysed.gov/" target="_blank" rel="noreferrer noopener">New York State Museum</a>, made the discovery in 2009. While scouting the former highway department property, his trained eye spotted wandering patterns in the stone that looked like marine features.



<h2 class="wp-block-heading" id="h-revolutionary-age-and-preservation">Revolutionary age and preservation</h2>



The site contains 385-million-year-old rocks with fossilized woody roots forming horizontal patterns up to 18 feet (5.5 meters) wide. As Christopher Berry, a paleobotanist at Cardiff University, explains: "You are walking through the roots of ancient trees."



This discovery pushes back advanced tree evolution by millions of years. The research, published in <a href="https://www.cell.com/current-biology/home" target="_blank" rel="noreferrer noopener">Current Biology</a> in December 2019, fundamentally changes our understanding of when complex forests first emerged.



Researchers believe a massive flood buried the forest floor, creating perfect fossilization conditions. Over millions of years, sediment hardened into rock, preserving these root patterns like nature's time capsule.



<h2 class="wp-block-heading" id="h-meet-archaeopteris-the-first-modern-tree">Meet Archaeopteris: the first modern tree</h2>



The star of this ancient forest is Archaeopteris – not to be confused with the feathered dinosaur Archaeopteryx. This tree was far older and more revolutionary.



William Stein from <a href="https://www.binghamton.edu/" target="_blank" rel="noreferrer noopener">Binghamton University</a> describes the roots as "strikingly modern, essentially what you'd see outside in my yard right now." These weren't simple root systems you'd expect from ancient plants.



Some fossilized roots are six inches (15 centimeters) in diameter, forming 36-foot-wide (11-meter) patterns. These giants grew up to 65 feet (20 meters) tall with five-foot-diameter (1.5-meter) trunks.



<h2 class="wp-block-heading" id="h-climate-changing-impact">Climate-changing impact</h2>



These trees fundamentally changed Earth's environment. Kevin Boyce, a Stanford University geoscientist, explains how their deep roots triggered "weathering," chemical reactions that pulled carbon dioxide from the atmosphere.



This process dropped atmospheric CO2 levels from 10-15 times higher than today to roughly modern concentrations. These ancient trees helped create atmospheric conditions that made complex life possible.



<h2 class="wp-block-heading" id="h-ancient-forest-ecosystem">Ancient forest ecosystem</h2>



The forest was remarkably diverse. Scientists identified Eospermatopteris, palm tree-like plants with short roots that reached 30 feet (9 meters) tall but lacked woody structure. The forest also housed cladoxylopsids and a mysterious third species still being studied.



All reproduced through spores rather than seeds – millions of years before seeds evolved. This tropical environment had no grass, flowers, or flying insects, just towering trees creating Earth's first complex forest canopy.



<h2 class="wp-block-heading" id="h-scientific-significance">Scientific significance</h2>



Before this finding, the Gilboa forest, located 25 miles (40 kilometers) away, held the "oldest forest" title. Cairo's trees are 2-3 million years older, showing that complex forest ecosystems developed much faster than scientists believed possible.



Patricia Gensel, a <a href="https://www.unc.edu/" target="_blank" rel="noreferrer noopener">University of North Carolina</a> paleobotanist, notes: "The size of those root systems is really changing the picture. Even 20 years ago, researchers assumed trees with such complex root systems didn't evolve so early."



The Cairo site presents three unique root systems, suggesting Devonian period forests were diverse ecosystems with different trees occupying different environmental niches, much like today's forests.



<h2 class="wp-block-heading" id="h-modern-preservation-efforts">Modern preservation efforts</h2>



In 2022, New York State Senator Michelle Hinchey secured a $170,000 grant for the town of Cairo to construct specialized fencing around the fossil forest site. The town plans to conduct a feasibility study exploring the possibility of creating an educational center and working lab on-site.



Joe Hasenkopf, chair of the Cairo Planning Board, hopes to partner with educational institutions to create a research facility serving scientists, students, and the public.



<h2 class="wp-block-heading" id="h-lessons-for-today-s-climate">Lessons for today's climate</h2>



Why does a 385-million-year-old forest matter today? It shows how dramatically forests can change Earth's climate. These ancient woodlands created the atmospheric conditions supporting complex life.



Understanding how prehistoric forests transformed the planet helps us appreciate modern forests' critical role in addressing climate change. Forests remain Earth's most effective carbon capture systems.



These prehistoric trees changed Earth's atmosphere by pulling massive amounts of carbon dioxide from the air. As we face modern climate challenges, this ancient forest reminds us of trees' incredible power to transform our planet's environment.



The next time you walk through a forest, remember you're experiencing an ecosystem whose blueprint was established 385 million years ago in upstate New York. These ancient pioneers didn't just survive – they thrived and changed the world forever.



The full study was published in the journal Current Biology.



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Earth's oldest forest found in the United States

https://www.youtube.com/watch?v=Ow3JH03PqEQ New York is the site of the world's oldest...

<figure class="wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio"><div class="wp-block-embed__wrapper">
https://www.youtube.com/watch?v=prrq8Ql81zk
</div><figcaption class="wp-element-caption">Acid rain and a crisis solved.</figcaption></figure>



<h2 class="wp-block-heading" id="h-why-don-t-we-ever-hear-about-acid-rain-anymore-the-environmental-crisis-that-was-solved">Why don't we ever hear about "acid rain" anymore? The environmental crisis that was solved</h2>



Remember the 1980s when acid rain dominated headlines? Dire warnings about rain eating buildings, killing fish, and destroying forests filled every news cycle. Then, almost like magic, acid rain vanished from public discourse. What happened? Did we actually solve one of the late 20th century's most pressing environmental challenges?



The answer might surprise you. Unlike many environmental issues that drag on indefinitely, acid rain represents one of modern history's most successful ecological recovery stories. It's a tale of science, politics, and technology working together to tackle what seemed impossible.



<h2 class="wp-block-heading">What was acid rain?</h2>



Acid rain isn't regular rain having a bad day – it's precipitation that became significantly more acidic due to air pollution. When power plants, factories, and vehicles burn fossil fuels, they release sulfur dioxide (SO2) and nitrogen oxides (NOx) into the atmosphere.



<h2 class="wp-block-heading">The science behind it</h2>



Think of acid rain as nature's chemistry experiment gone wrong. These compounds react with water, oxygen, and other chemicals to form sulfuric and nitric acids. When mixed with water vapor in clouds, they create precipitation with dangerously low pH levels.



While clean rain has a pH of about 5.6, acid rain could drop as low as 4.2 to 4.4 – roughly as acidic as tomato juice or coffee. According to US Geological Survey documentation, Scottish chemist Angus Smith first coined "acid rain" in 1872, but it didn't become a household phrase until the 1960s and 1970s when Swedish scientist Svante Odén documented its devastating effects on Scandinavian lakes and European forests.



<h2 class="wp-block-heading">The crisis at its peak</h2>



During the height of public concern, environmental damage was both widespread and visible. This wasn't some abstract future threat – people could see destruction happening in real-time.



<h2 class="wp-block-heading">Environmental devastation</h2>



The most dramatic impacts were impossible to ignore. Research documented by the Adirondack Lakes Survey Corporation and the New York State Department of Environmental Conservation shows that in the Adirondack Mountains, more than 200 lakes became so acidic they couldn't support fish life. The Adirondack Council reports that 409 lakes once supported brook trout, but many lost their fish populations due to acid rain.



By 1976, when scientists cataloged all acidified lakes in the Adirondack Park, researchers found that half of the lakes over 2,000 feet above sea level had no fish, according to studies published in environmental journals. The acidification process worked like a slow-motion disaster. As acid rain fell into watersheds, it gradually lowered pH levels. Fish couldn't survive in acidic water, and their food sources died off too.



Trees at high elevations showed stress directly linked to acid rain. It weakened them by leaching nutrients and making them susceptible to disease. Historical records show Germany's Black Forest saw nearly half its trees damaged by the mid-1980s.



<h2 class="wp-block-heading">Economic impact</h2>



Acid rain wasn't just environmental – it was expensive. Acidic precipitation corroded infrastructure, buildings, and monuments. Historic stone structures deteriorated at accelerated rates. Tourism suffered as lakes became fishless and forests declined. EPA economic analyses from the period documented repair costs mounting into billions annually.



<h2 class="wp-block-heading">The solution: government action and technology</h2>



Transformation from crisis to success required unprecedented cooperation between governments, industries, and environmental groups.



<h2 class="wp-block-heading">The Clean Air Act of 1990</h2>



The turning point came with the Clean Air Act Amendments of 1990, signed by President George H.W. Bush. This represented a fundamentally new approach to environmental regulation, as documented in EPA historical records.



<h2 class="wp-block-heading">Cap-and-trade success</h2>



Instead of mandating specific technologies, the 1990 amendments introduced something revolutionary: a cap-and-trade system for sulfur dioxide emissions. EPA program documentation shows this market-based approach set overall limits but allowed companies to trade emission allowances.



The genius was harnessing market forces to find cost-effective pollution reduction. Companies reducing emissions cheaply could sell excess allowances to those facing higher costs. Research published in environmental economics journals and EPA progress reports shows this resulted in dramatic SO2 reduction at a fraction of projected costs.



<h2 class="wp-block-heading">Technology advances</h2>



Policy provided the framework, but technology made reductions possible. Studies in atmospheric science journals document the widespread adoption of flue gas desulfurization systems ("scrubbers") that removed sulfur dioxide before it reached the atmosphere. By the 2000s, new installations could remove over 95% of SO2 emissions, according to EPA technical reports.



The push coincided with cleaner energy development. Natural gas produces fewer sulfur compounds than coal. Wind and solar, emerging in the 1990s, captured growing market share, reducing reliance on high-sulfur coal.



<h2 class="wp-block-heading" id="h-why-we-don-t-hear-about-it-today">Why we don't hear about it today</h2>



Why did acid rain disappear from headlines? Simple: the problem was largely solved.



<h2 class="wp-block-heading">Success doesn't make news</h2>



There's an old journalism saying: "If it bleeds, it leads." Environmental success stories don't generate urgency like crisis reporting. Media attention shifted to other challenges: climate change, plastic pollution, and biodiversity loss. There's only so much environmental anxiety the public can absorb, and newer concerns replaced acid rain.



<h2 class="wp-block-heading">Mission accomplished</h2>



The primary reason is beautifully simple: interventions worked. EPA monitoring data shows sulfur dioxide emissions dropped over 90% since 1990. Academic research published in environmental science journals confirms pH levels in formerly affected areas returned closer to normal. This represents one of history's most dramatic environmental recoveries. Studies by the Adirondack Lakes Survey Corporation show fishless lakes now support healthy populations. Forests recovered, and building damage slowed dramatically.



<h2 class="wp-block-heading" id="h-is-it-really-gone">Is it really gone?</h2>



The crisis is largely resolved, but monitoring data shows the problem isn't completely eliminated – it's managed to acceptable levels. Some areas still experience occasional events during high pollution periods. International environmental research indicates that rapidly industrializing Asian countries face similar problems to what we experienced decades ago, though they're implementing successful strategies.



EPA research shows nitrogen oxide emissions proved more challenging than sulfur dioxide, coming from vehicles and mobile sources. Climate science studies suggest changing weather patterns add complexity to how acid rain forms and falls.



<h2 class="wp-block-heading">What this teaches us</h2>



The acid rain experience proves that seemingly intractable environmental problems can be solved with scientific understanding, political will, and technological innovation. Environmental monitoring data shows recovery speed was remarkable – within a decade, measurable improvements appeared in air quality and ecosystem health.



Success came from bipartisan support across party lines. Policy analysis studies show the market-based approach appealed to those preferring economic incentives while achieving environmental goals. This support created lasting policy surviving political changes.



<h2 class="wp-block-heading">Conclusion</h2>



Acid rain's disappearance from public consciousness represents environmental science's greatest success stories. Through effective regulation, technological innovation, and international cooperation, we transformed an overwhelming crisis into a manageable challenge.



Today's silence isn't because we forgot – it's because we solved it. The 1990 Clean Air Act, combined with technology and energy market changes, reduced acid rain emissions over 90%, according to comprehensive EPA data analysis.



This success offers hope for current challenges. It proves complex problems can be solved when science, policy, and technology work together. As we face climate change and plastic pollution, acid rain reminds us that dramatic positive change is possible.



Next time someone asks whether environmental regulations work, remember acid rain. It's proof that sometimes, we get it right.



<hr class="wp-block-separator has-alpha-channel-opacity"/>



Sources: This article draws from EPA official documentation and progress reports, peer-reviewed research published in environmental and atmospheric science journals, historical data from the Adirondack Lakes Survey Corporation, New York State Department of Environmental Conservation records, US Geological Survey publications, policy analysis studies, and environmental monitoring data collected over three decades.



<h2 class="wp-block-heading">Frequently Asked Questions</h2>



1. Is acid rain completely gone? No, but EPA monitoring shows it's reduced to manageable levels. US sulfur dioxide emissions dropped over 90% since 1990, making acid rain much less severe than the 1980s crisis.



2. How long did solving take? Environmental monitoring data shows significant improvements began within 5-10 years of 1990s emission controls. Full ecosystem recovery took longer – some areas need 20-30 years for complete recovery.



3. What made the solution successful? Clear scientific understanding, visible damage motivating action, bipartisan support, available technology, and innovative market-based policies like cap-and-trade.



4. Do other countries have acid rain problems? Yes, particularly rapidly industrializing Asian countries. However, international environmental research shows many implement similar successful control strategies.



5. Could acid rain return? Potentially, if regulations weaken or we return to high-sulfur coal without controls, though effects would take years to become severe according to environmental projections.



6. Can you recommend any teaching tools on the subject of "acid rain"? The United States Environmental Protection Agency produced a wonderful teacher's guide for ages 14 and under that you can find on the EPA website here: <a href="https://www.epa.gov/sites/default/files/2017-03/documents/teachersguide.pdf" target="_blank" rel="noreferrer noopener">https://www.epa.gov/sites/default/files/2017-03/documents/teachersguide.pdf</a>



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The environmental problem we actually solved

https://www.youtube.com/watch?v=prrq8Ql81zk Acid rain and a crisis solved. Why don't we...

Fresh,Radish,Harvest,On,Soil,In,Garden.

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Mid-July is an opportune time to kick-start a thriving fall garden, and this guide lays out the best vegetables and herbs to plant now for a fruitful autumn harvest. 



Fast-growing leafy greens such as spinach, lettuce, kale, and arugula perform especially well in the waning summer heat, with harvests beginning as soon as 30 days. 



These cool-season crops relish the transition into fall, offering repeated yields with cut-and-come-again methods.



Root vegetables like radishes, carrots, and beets also excel during this period. Radishes deliver satisfaction in under a month, while carrots and beets mature in about two months. Employing succession planting ensures a continuous stream of produce deep into the cooler months. 



For a boost of fresh flavor, herbs like cilantro, basil, dill, and chervil are excellent picks. These heat-loving varieties flourish in July’s warmth and are harvest-ready in about 30 days, especially when sown continuously.



Gardeners in zones 6 through 9 can benefit from planting bush beans and snap peas, which don’t require trellising and are ideal for compact plots. 



Maturing in 50–60 days, they’re a smart choice for quick, protein-rich harvests. For those in hotter regions, heat-tolerant crops such as okra and southern peas provide reliable yields and thrive in scorching conditions.



This guide emphasizes more than crop selection—it highlights the importance of timing, soil preparation, and ongoing sowing techniques. 



With thoughtful planning and attention to regional climate needs, even late-summer gardeners can enjoy fresh salads, hearty stews, and the satisfaction of a robust, homegrown harvest well into fall.



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What to plant in your garden in mid-July

https://youtu.be/Fi2OeEwuzRM?si=vTyd2m9FMmtyWkex Mid-July is an opportune time to kick-start a thriving...

Green,Ecoduct,Over,An,Empty,Highway,During,Sunset.

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A new long-term study in Monkton, Vermont, reveals that wildlife tunnels significantly reduce amphibian road mortality during seasonal migrations. 



Frogs and salamanders often cross roads to reach breeding ponds each spring, but many are killed by vehicles. 



Researchers from the <a href="https://www.uvm.edu/" target="_blank" rel="noreferrer noopener">University of Vermont</a>, in collaboration with local citizens and the Vermont Agency of Natural Resources, installed two underpass tunnels in 2015. 



Over a 12-year monitoring period, they observed an 80.2% reduction in amphibian deaths, and up to 94% for non-climbing species like salamanders. 



The study used a before-after-control-impact design and documented more than 5,200 amphibians, highlighting the tunnels’ effectiveness even in nearby buffer zones.



Funded at $342,397 - far cheaper than wildlife crossings for large mammals - the project showcased the power of community-led conservation.



Local groups initiated the effort after observing mass amphibian deaths. Wildlife cameras later captured over 2,200 amphibians using a tunnel in just one spring, along with other species like raccoons and bobcats, indicating wider ecosystem benefits.



This marks the first peer-reviewed, long-term data set in the northeastern U.S. confirming amphibian-specific underpasses work. 



The study urges transportation departments to incorporate these designs into road planning and highlights how community action, thoughtful infrastructure, and persistence can make a real difference for biodiversity.



The full study was published in the <a href="https://linkinghub.elsevier.com/retrieve/pii/S1617138125000780" target="_blank" rel="noreferrer noopener">Journal for Nature Conservation</a>.



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Wildlife tunnels save millions of amphibians

https://youtu.be/XYgiPzmNBTU?si=eFYY7gPHU1JznLvU A new long-term study in Monkton, Vermont, reveals that...

Scientists are transforming chocolate into a functional food by infusing it with probiotics and prebiotics, aiming to create a treat that satisfies cravings while supporting gut health. 



The challenge lies in maintaining chocolate's beloved texture and flavor while adding health benefits.



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Probiotics - beneficial microbes that balance gut bacteria and aid digestion - are typically fragile and can be destroyed by stomach acid or processing. 



Prebiotics act as food for these microbes, helping them thrive. Together, they form "synbiotics," a powerful health combination.



Researchers Smriti Gaur and Shubhi Singh from India's Jaypee Institute of Information Technology took an innovative approach, using natural prebiotics like corn and honey instead of complex processing methods. 



They created five chocolate varieties: a control and four synbiotic versions containing different combinations of prebiotics, probiotics (Lactobacillus strains), and flavor enhancers (cinnamon or orange).



Laboratory simulations of human digestion showed the probiotics remained viable for over five hours, suggesting they could survive long enough to benefit gut health.



Taste tests were positive, with researchers particularly enjoying the orange-flavored variety, describing it as having "vibrant citrus notes" complementing the "rich cocoa" with a "luxurious" texture.



This research represents just the beginning. With further refinement of strains, textures, and flavors, chocolate could evolve beyond mere indulgence to become a functional food that nourishes while it delights.



The study is published in the journal <a href="https://pubs.acs.org/doi/10.1021/acsfoodscitech.4c00741" target="_blank" rel="noreferrer noopener">ACS Food Science &amp; Technology</a>.

Is chocolate the next nutritional powerhouse?

Scientists are transforming chocolate into a functional food by infusing...

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features Nushagak Bay, a large estuary in southwest Alaska. Nushagak runs mainly north to south and exits in Bristol Bay, a large body of water in the Bering Sea.



"The bay is primarily fed by the Nushagak River, which begins in the Alaska Range and flows southwest approximately 450 km. The bay is also fed by several additional rivers including the Wood, Igushik, Snake and Weary rivers," says ESA.



"The dark colors of the Nushagak River are most likely due to tannins or lignins (chemical substances found in plants). Tannins and lignins from roots, leaves, seeds, bark and soil can leach into the water and give it a brown or even black colour. The sediments then flow southwards where it is mixed with the bluer waters of the bay."



Video/ Image Credit: ESA



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By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Nushagak Bay in southwest Alaska

[sendtonews key="0ynNMYkMKa-2340414-12187" type="single"] Today’s Video of the Day from the...

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Today's Video of the Day from the <a href="https://www.acs.org/">American Chemical Society</a> (ACS) reveals that proteins on flu viruses are actually flexible, tilting and waving in a “breath-like” motion. According to the experts, these proteins could be used to better defend against the flu.



"The main antigenic targets of influenza virus are two surface glycoproteins, hemagglutinin (HA) and neuraminidase (NA). Whereas the structural and dynamical properties of both glycoproteins have been studied previously, the understanding of their plasticity in the whole-virion context is fragmented," wrote the researchers.



To investigate, the team conducted detailed simulations of the influenza A H1N1 virion, or the swine flu. The experts concluded that the visualizations show many new vulnerable states of flu viruses, which could improve future vaccines and antiviral drugs.



Video/ Image Credit: American Chemical Society&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Flu viruses are more flexible than expected

[sendtonews key="G9bUoxcjr4-2511624-12187" type="single"] Today's Video of the Day from the...

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features Lake Trasimeno, which is located west of Perugia in central Italy. It is the fourth largest lake in the country. While Trasimeno’s water level varies, it has a maximum depth of approximately six meters.&nbsp;



"In this Copernicus Sentinel-2 image, captured on 6 August 2022, the lake’s emerald green colour is likely due to the presence of phytoplankton. Streaks in the water, particularly visible in the west, indicate the presence of soil and sediments which have been stirred up by winds. Dark colored waters in the southern part of the lake indicate a presence of submerged and floating macrophytes (aquatic plants) as well as algae," says ESA.



"Surrounded by hills on three sides, Trasimeno is subject to heavy storms created by winds, especially from the north and west. There are three islets in the lake: Maggiore, Minore and Polvese (the largest). The lake’s shores are sparsely inhabited with only two popular villages: Castiglione del Lago and Passignano sul Trasimeno."



"Italy is experiencing its worst drought in 70 years which has affected drinking water supplies, hydroelectric power and agricultural production. High temperatures, hot winds and lack of rainfall are the main causes of drought in the Umbrian region which saw Lake Trasimeno’s drop 1.3 m, reaching the limit of the hydrometric zero in July 2022."



Video/Image Credit: ESA&nbsp;



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By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Lake Trasimeno in Central Italy

[sendtonews key="3upvlAaHgO-2256633-12187" type="single"] Today’s Video of the Day from the...

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Today's Video of the Day from the <a href="https://www.acs.org/">American Chemical Society</a> describes a new self-powered nanosensor that can instantly detect mercury contamination with the tap of a finger.&nbsp;



The oxidized form of mercury can be harmful when it is ingested through contaminated water or food. This makes it necessary for experts to develop sensors that can quickly and accurately detect the presence of mercury.&nbsp;



Zong-Hong Lin and colleagues have now created a triboelectric nanosensor (TENS) that can detect mercury by simply by touching a sample. According to the researchers, their TENS could serve as the basis for similar devices to safely and remotely monitor other pollutants.



Video Credit: American Chemical Society&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Detecting mercury contamination with the tap of a finger

[sendtonews key="LvS8v8bp9z-2564889-12187" type="single"] Today's Video of the Day from the...

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Today’s Video of the Day from the <a href="https://www.acs.org/">American Chemical Society</a> explores the ability of salt to transform the way that foods and beverages taste. Salt is known to cover up undesirable flavors, such as bitterness in coffee or beer, but how exactly does sodium chloride change the taste of other compounds?



One previous study showed that, not only does salt suppress bitterness, but also enhances sweetness and sourness. Another study revealed that bitterness reduction by salt seems to be happening at the tongue receptor level as well as in the brain.&nbsp;



While it is known that salt taste is mediated by the presence of sodium channels in the form of taste buds, experts believe that there is also an unknown receptor responsible for how we taste salt that has not yet been identified.&nbsp;



Video Credit: ACS Reactions



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

How does salt makes things taste better?

[sendtonews key="X0f6OHYoI4-2310561-12187" type="single"] Today’s Video of the Day from the...

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features Santiago, the capital city of Chile. The city is located in the center of the Santiago Metropolitan Region, which has a population of about eight million people.&nbsp;



'The weather of Santiago resembles the Mediterranean climate with dry and warm summers with temperatures reaching up to 35°C (from October to March) and cool and humid winters that can drop to 0°C (from April to September)."



"The city lies in the centre of the country’s central valley around 80 km from the Pacific Ocean to the west and borders Argentina to the east. A tiny part of Argentina is visible in the top-right corner of the image where the mountain crest of the Andes Mountains acts as a divider between the two countries," says ESA.



Video/ Image Credit: ESA



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Santiago, Chile in South America

[sendtonews key="JRaP49ISmm-2357509-12187" type="single"] Today’s Video of the Day from the...

Spiral,Galaxy,,Illustration,Of,Milky,Way

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Astronomers at <a href="https://www.jhu.edu/">Johns Hopkins University</a> have created an interactive map of the universe, including the actual position and real colors of 200,000 galaxies. The map allows the public to access data that was previously only available to scientists.



The map was developed using data collected by the Sloan Digital Sky Survey. For over two decades, a telescope in New Mexico was aimed at slightly different locations to capture the night sky.&nbsp;



"Growing up I was very inspired by astronomy pictures, stars, nebulae and galaxies, and now it's our time to create a new type of picture to inspire people," said map creator Brice Ménard, a professor at Johns Hopkins. "Astrophysicists around the world have been analyzing this data for years, leading to thousands of scientific papers and discoveries. But nobody took the time to create a map that is beautiful, scientifically accurate, and accessible to people who are not scientists. Our goal here is to show everybody what the universe really looks like."



"In this map, we are just a speck at the very bottom, just one pixel. And when I say we, I mean our galaxy, the Milky Way which has billions of stars and planets. We are used to seeing astronomical pictures showing one galaxy here, one galaxy there or perhaps a group of galaxies. But what this map shows is a very, very different scale."



"From this speck at the bottom, we are able to map out galaxies across the entire universe, and that says something about the power of science."



The <a href="https://mapoftheuniverse.net/">interactive map</a> is available online, where it can be downloaded for free.



Video Credit: Johns Hopkins&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Interactive map of the universe includes 200,000 galaxies

[sendtonews key="e4ZG0Jawp3-2374785-12187" type="single"] Astronomers at Johns Hopkins University have created...

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Lesotho: Africa's "Kingdom in the Sky" Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features northwest Lesotho in South Africa.



According to ESA, Lesotho is the only nation in the world that lies completely above 1,000 m in elevation. The country is famous for its tall mountains and narrow valleys, and is known as Africa's "Kingdom in the Sky."



Out of a population of around two million people, about 80 percent live in rural areas. More than 75 percent of these people are engaged in <a href="https://www.earth.com/news/climate-change-will-have-a-global-impact-on-agriculture/">agriculture</a>, including rainfed cereal production and animal grazing.&nbsp;



ESA reports that the country’s agricultural system faces a growing number of issues, with climate-related vulnerabilities such as drought, floods and extreme temperatures occurring more frequently. 



Diamonds are amongst the minerals found in the mountains. Indeed, Lesotho can truly be called the Kingdom in the Sky. Beautiful, culturally rich, safe, affordable, and easily accessible from Durban and Johannesburg, mountainous Lesotho is a vastly underrated travel destination. the Kingdom of Lesotho (Sotho: 'Muso oa Lesotho) is an enclaved country in southern Africa. It is just over 30,000 km2 (11,583 sq mi) in size and has a population of around 2 million.



Video Credit: ESA&nbsp;&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer 



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Lesotho: Africa's "Kingdom in the Sky"

[sendtonews key="uV9Lh2fQbV-1760058-12187" type="single"] Lesotho: Africa's "Kingdom in the Sky" Today’s...

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Today's Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features Dublin, the capital and largest city of Ireland. Beyond its pub culture, Dublin is known as a modern culinary destination and a UNESCO City of Literature.



"Dublin is located near the midpoint of Ireland’s east coast in the province of Leinster. The city, which covers an area of around 115 square kilometers, is bordered by the Dublin Mountains, a low mountain range to the south, and is surrounded by flat farmland to the north and west," says ESA.



"The city straddles the River Liffey, which rises in the Wicklow Mountains and flows around 80 kilometers eastwards through the city of Dublin, in which it is canalised and bordered with quays. It then empties into Dublin Bay, an arm of the Irish Sea."



Dublin has an abundance of green spaces, including one of the largest enclosed public parks in any European capital city. Phoenix Park, which was originally formed as a royal hunting park in the 1660s, includes 707 hectares of green space.



Video Credit: ESA&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

The city of Dublin on Ireland's east coast

[sendtonews key="qjvhBOBnY8-2426650-12187" type="single"] Today's Video of the Day from the...

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Today's Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features the province of Zaragoza in northeast Spain. The image was captured by the Copernicus Sentinel-2 mission.



"Together with the provinces of Huesca and Teruel, Zaragoza formed the old kingdom of Aragon. Its capital, also called Zaragoza (not visible in this image) is home to around half of Aragon’s population," says ESA.



"The Ebro River can be seen winding its way through the province from west to east in this image. Between its source in the Cantabrian Mountains in the northwest and its delta on the Mediterranean coast, the Ebro River is fed by more than 200 tributaries as it flows 910 km across much of northern Spain."



Since rainfall is very scarce in this region, irrigation in the Ebro basin is critically important. In the valleys surrounding the Ebro River, many fields are used for growing crops such as corn, wheat, and barley.



Video/ Image Credit: ESA



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

The province of Zaragoza in northeast Spain

[sendtonews key="oL4FnPTGCV-2384527-12187" type="single"] Today's Video of the Day from the...

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Today’s Video of the Day from <a href="https://earthobservatory.nasa.gov/">NASA Earth Observatory</a> reveals the evolution of the Columbia Glacier in southeastern Alaska. Columbia is among the fastest shrinking glaciers in the world, and the video documents its rapid retreat over the years.&nbsp;



Columbia Glacier is a large, multi-branched calving glacier that flows out of the Chugach Mountains to the Prince William Sound.&nbsp;



According to USGS, Columbia had a long history of stability prior to 1980, with a length 41 miles, and small, short-lived advances or retreats.



In the years since 1980, however, satellite images have captured Columbia’s alarming retreat. By using false-color images, scientists can distinguish between snow and ice, open water, vegetation, and rocky debris on the glacier’s surface.



The series of false-color images featured in today's video were acquired over the span of 35 years. You can see that by 2021, the glacier’s main branch had retreated about 15 miles from its initial position.



The Columbia Glacier has also lost more than 50 percent of its volume, mostly due to calving. <a href="https://www.earth.com/video/nasa-reveals-3d-visual-of-an-atmospheric-river/">NASA</a> reports that while climate change likely started the retreat, mechanical processes kept the disintegration going.



The NASA images are provided by Jesse Allen, Robert Simmon, Joshua Stevens, and Lauren Dauphin using data from Landsat satellites, from the U.S. Geological Survey, and data from MODIS on NASA’s Terra satellite. The structure of Columbia’s moraine played a large role in the stability of the glacier before 1980. 



Like other tidewater glaciers, the Columbia built up a moraine over time, and the mixture of ice and rock functioned like a dam keeping out the sea. It was supported on one end by the shoreline and by the underwater terminal moraine at the other.



Video Credit: NASA Earth Observatory/&nbsp; NASA’s Scientific Visualization Studio



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

The rapid retreat of the Columbia Glacier

[sendtonews key="0879czfG3k-1785905-12187" type="single"] Today’s Video of the Day from NASA...

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features the Pyrenees Mountains, which form a natural boundary between France and Spain in southwest Europe.



The mountain range is 430 kilometers in length. It stretches from the Mediterranean Sea on the east to the Atlantic Ocean on the west.



At an elevation of 3404 meters, Pico de Aneto is the highest mountain peak in the Pyrenees, and the third-highest peak in Spain. Pico de Aneto is located in the Posets-Maladeta Natural Park, which spans more than 82,000 acres.&nbsp;



"Geological studies have revealed that the Pyrenees Mountains have been around for longer than the Alps, with their sediments first deposited in coastal basins during the Paleozoic and Mesozoic eras," reports ESA.



"The entire mountain range formed due to the upwelling of large sedimentary rocks by the collision of the Iberian and the Eurasian plate around 100 to 150 million years ago, followed by intense erosion from ice and water."



The western Pyrenees receive more precipitation due to moisture blowing in from the Atlantic Ocean. The mountain range contains many lakes, several small glaciers, and some of the highest waterfalls in Europe.



Video &amp; Image Credit: ESA



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

The Pyrenees Mountains in southwest Europe

[sendtonews key="6HyfrAJTBI-1831843-12187" type="single"] Today’s Video of the Day from the...

Earth,Like,Exoplanet,3d,Render

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Today's Video of the Day from <a href="https://www.nasa.gov/goddard">NASA Goddard</a> describes two exoplanets that are orbiting a star 218 light-years away. A team of researchers led by the University of Montreal has found evidence that these planets are "water worlds."



The experts used data from NASA’s Hubble and Spitzer Space Telescopes. They discovered that exoplanets Kepler-138 c and Kepler-138 could be composed largely of water.



"We previously thought that planets that were a bit larger than Earth were big balls of metal and rock, like scaled-up versions of Earth, and that's why we called them super-Earths," explained study co-author Björn Benneke.&nbsp;



"However, we have now shown that these two planets, Kepler-138 c and d, are quite different in nature and that a big fraction of their entire volume is likely composed of water. It is the best evidence yet for water worlds, a type of planet that was theorized by astronomers to exist for a long time."



Video Credit: NASA Goddard



Image Credit: NASA, ESA, and Leah Hustak (STScI)



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Two distant planets may be "water worlds"

[sendtonews key="QIoVYJqRBi-2434608-12187" type="single"] Today's Video of the Day from NASA...

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Satellites reveal how Earth's systems are interconnected Today’s Video of the Day from <a href="https://www.nasa.gov/goddard">NASA Goddard</a> describes Earth’s interconnected systems, and how this network is affected by rising temperatures.&nbsp;



During 2020, average global temperatures matched the hottest year on record. The hurricane season was also record-breaking, with many of the storms intensifying at extraordinary speeds. Hot water in the ocean is fuel for hurricanes. The satellite data shows that it's all one interconnected system showing how Satellites reveal how Earth's systems are interconnected.



According to NASA, dust swept up from Northern Africa plays a major role in the formation of hurricanes, and is also a key source of fertilization in the Amazon rainforest. As a result of<a href="https://www.earth.com/news/seagrass-wasting-disease-is-fueled-by-climate-change/"> climate</a> change, dust plumes are expected to decline, which will have an effect on vegetation far away.&nbsp;



Images from Earth-observing satellites show how the world’s plant life is affected by natural disasters, fires, and deforestation. Satellites also reveal how widespread changes in vegetation impact waterways,&nbsp; the climate, air quality. Satellites communicate by using radio waves to send signals to the antennas on the Earth. "Earth From Space" is a groundbreaking two-hour special that reveals a spectacular new space-based vision of our planet. 



Video Credit: NASA Goddard&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Satellites reveal how Earth's systems are interconnected

[sendtonews key="JbW4VsY53O-1632195-12187" type="single"] Satellites reveal how Earth's systems are interconnected...

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