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A burning California landfill has made neighbors miserable for 3 years. Can lawmakers help?

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Friday, March 14, 2025

In summary A smoldering reaction under the Chiquita Canyon Landfill in Southern California has made its neighbors’ lives miserable for almost three years. A bill that seeks to compensate them faces uncertainty amid state budget challenges and bigger LA County wildfires. For more than two years, Assemblymember Pilar Schiavo’s constituents have been complaining to her about the stench and fumes they’ve been breathing since trash buried at the Chiquita Canyon Landfill in Southern California ignited and never stopped burning. Shiavo, a Democrat representing the Santa Clarita Valley north of Los Angeles, decided to spend the night as a guest of one of the 639-acre landfill’s closest neighbors. She wanted to experience for herself what life is like for the hundreds of people who’ve complained about the noxious fumes since the underground chemical reaction started below the Castaic landfill in May 2022.  It’s not known what caused the chemical reaction, but federal officials say the burn zone has grown underground to at least 35 acres. As the landfill belches a stench like rotten milk, residents allege chemical emissions are making them sick. And it could keep burning for years.When she arrived in Val Verde, it didn’t take long before Schiavo got a pounding headache. Her skin felt itchy. When she woke up the following day, she was disturbed to get her first bloody nose in years, she said. “People are getting sick,” Schiavo said in a video diary taken on her phone during her stay last fall. “People are being barricaded in their homes, and not opening windows and doors and not letting kids come out and play on trampolines because they’re afraid of breathing the air. … We have to get people out of here and keep them safe.” This week, the state Assembly held its first committee hearing for her legislation, Assembly Bill 27, a measure co-authored by six Southern California Democrats that would spare residents from paying taxes on the compensation they have received from the landfill’s owner. The relief fund set up by Texas-based Waste Connections can be used to pay for additional costs such as higher electricity from running air filters and air conditioners and for temporary housing. Faced with lawsuits from residents and Los Angeles County, Waste Connections opened the fund from March 2024 to February to the residents of Val Verde, Live Oak, Hasley Hills, Hillcrest Parkway, Hasley Canyon and Stevenson Ranch. The company didn’t respond to an interview request, but it says on its website that the payments were expected to exceed $25 million. In December the company said in response to a lawsuit that 1,829 households had received funding. “In addition, Chiquita has distributed nearly 3,000 air purifiers to local residents at a cost of over $1 million, and has paid to ensure every school near the landfill has carbon filtration in every classroom and multipurpose space,” the company said. The company maintains that it has taken steps to try to contain the reaction, but just this week state officials told community members in Castaic that the underground heat zone had expanded beyond a plastic cover over the landfill’s surface to try to contain emissions. Chiquita Canyon residents seek state relief Steven Howse, 50, is one of the residents who’s accepted the company’s funds. He told the Assembly Revenue and Taxation Committee that the money helped make life somewhat more bearable for his family, whose home is just 1,600 feet from the 53-year-old landfill that stopped trucking in more trash late last year. Howse’s family, like many of its neighbors, claims the landfill’s emissions have made them sick. He said his wife was recently diagnosed with breast cancer and one of their four children was diagnosed with a rare autoimmune disease. He said he’s constantly battling respiratory illnesses.  He didn’t tell the committee how much he received, but said he used the cash for upgrades for his home to “harden” it to prepare for wildfires. He also had to upgrade the home’s air conditioning system and buy new air filters and windows to try to keep the stench out.  “A lot of times we had to leave the area due to the toxins … because it would be so bad at our house,” he said. “We also used the funds to take our RV trailer out of the area or visit family when we just couldn’t take it any longer.” Richard Humanic, second from left, wears a gas mask while joining fellow residents of Val Verde and Castaic in a protest calling for the closure of Chiquita Canyon Landfill at Hasley Canyon Park in Castaic on Feb. 22, 2024. Photo by Allen J. Schaben, Los Angeles Times via Getty Images Howse has a job in the film industry, but Schiavo said other low-income residents who qualify for state assistance programs have been bumped up to a higher tax bracket after taking the payments. “The concern has been that if you take those funds, then do you no longer qualify for CalFresh or Medi-Cal? Does it count against you because of that?” she told the committee. “Are you paying taxes now on this when that money comes in and it goes right out to pay for the costs that are associated with living with this disaster?” Landfill blaze comes amid wildfire budget challenges It’s no sure bet that the bill will advance to become law. Last year, Gov. Gavin Newsom vetoed two similar bills that would have exempted victims of three wildfires from paying state income taxes on settlement payments from the companies alleged to have started those fires.  Learn more about legislators mentioned in this story. Pilar Schiavo Democrat, State Assembly, District 40 (Santa Clarita Valley) Now the state’s budget priorities are uncertain as officials and lawmakers continue to hash out how to pay for Los Angeles wildfire relief, hostility from the Trump administration and a home insurance and affordability crisis.The Revenue and Taxation committee didn’t vote for the measure on Monday, instead moving it to the committee’s “suspense file” for further fiscal analysis. In the meantime, residents aren’t likely to get tax relief from the federal government.Late last year, then-President Joe Biden signed into law a bill that exempted wildfire settlement payments from federal income taxes, but the landfill’s relief funds don’t count since the Chiquita Canyon Landfill site has never been declared an official state or federal disaster.  Meanwhile, residents have filed more than 25,000 complaints to local air quality officials since 2023. The South Coast Air Quality Management District and other state regulators have issued dozens of violation notices. In November, the air district ordered the company to create a webpage that includes real-time air monitoring of smelly or potentially harmful pollutants, including hydrogen sulfide, methane, dimethyl sulfide and volatile organic compounds. As an example of how residents might be breathing potentially toxic fumes, air quality officials noted early last year that local air monitoring data showed that more than one-third of all readings exceeded state standards for hydrogen sulfide, which the U.S. Environmental Protection Agency says can cause eye irritation, headaches and fatigue, as well as potentially causing cancer or be lethal in highly concentrated doses. Owner Waste Connections faces citations In June, the U.S. EPA also cited the landfill company for violating various regulations intended to safeguard human health. The company is facing potential  civil penalties of up to $59,114 for each day of violation. “EPA cannot comment on ongoing investigations, including assessment of penalties,” EPA spokesperson Joshua Alexander said in an email. Schiavo said that her night’s stay next to the landfill made it clear to her that residents need to get out of there until the trash stops burning.  She has also authored Assembly Bill 28, which would secure state help for the residents around the landfill to find new or temporary housing until it stops smoldering. The details of that bill are still being hashed out. “People are in this terrible situation where they can’t afford to leave because housing is so expensive. Now (after the LA fires), it’s almost impossible,” she told CalMatters.  “And if you sell, who’s going to want to buy it? Then if you’re leaving, you know, you have this moral dilemma. People are like, ‘I don’t want to sell to someone else and then (what if) they start getting sick or their kids start getting sick?’ It’s this horrible situation. We just have to relocate people out of there right now, until it’s safe for folks to go back.”

A smoldering reaction under the Chiquita Canyon Landfill in Southern California has made its neighbors' lives miserable for almost three years. A bill that seeks to compensate them faces uncertainty amid state budget challenges and bigger LA County wildfires.

An aerial view of a yellow construction truck as it drives through piles of trash on a plot of dirt in a landfill.

In summary

A smoldering reaction under the Chiquita Canyon Landfill in Southern California has made its neighbors’ lives miserable for almost three years. A bill that seeks to compensate them faces uncertainty amid state budget challenges and bigger LA County wildfires.

For more than two years, Assemblymember Pilar Schiavo’s constituents have been complaining to her about the stench and fumes they’ve been breathing since trash buried at the Chiquita Canyon Landfill in Southern California ignited and never stopped burning.

Shiavo, a Democrat representing the Santa Clarita Valley north of Los Angeles, decided to spend the night as a guest of one of the 639-acre landfill’s closest neighbors. She wanted to experience for herself what life is like for the hundreds of people who’ve complained about the noxious fumes since the underground chemical reaction started below the Castaic landfill in May 2022. 

It’s not known what caused the chemical reaction, but federal officials say the burn zone has grown underground to at least 35 acres. As the landfill belches a stench like rotten milk, residents allege chemical emissions are making them sick. And it could keep burning for years.

When she arrived in Val Verde, it didn’t take long before Schiavo got a pounding headache. Her skin felt itchy. When she woke up the following day, she was disturbed to get her first bloody nose in years, she said.

“People are getting sick,” Schiavo said in a video diary taken on her phone during her stay last fall. “People are being barricaded in their homes, and not opening windows and doors and not letting kids come out and play on trampolines because they’re afraid of breathing the air. … We have to get people out of here and keep them safe.”

This week, the state Assembly held its first committee hearing for her legislation, Assembly Bill 27, a measure co-authored by six Southern California Democrats that would spare residents from paying taxes on the compensation they have received from the landfill’s owner. The relief fund set up by Texas-based Waste Connections can be used to pay for additional costs such as higher electricity from running air filters and air conditioners and for temporary housing.

Faced with lawsuits from residents and Los Angeles County, Waste Connections opened the fund from March 2024 to February to the residents of Val Verde, Live Oak, Hasley Hills, Hillcrest Parkway, Hasley Canyon and Stevenson Ranch. The company didn’t respond to an interview request, but it says on its website that the payments were expected to exceed $25 million. In December the company said in response to a lawsuit that 1,829 households had received funding.

“In addition, Chiquita has distributed nearly 3,000 air purifiers to local residents at a cost of over $1 million, and has paid to ensure every school near the landfill has carbon filtration in every classroom and multipurpose space,” the company said

The company maintains that it has taken steps to try to contain the reaction, but just this week state officials told community members in Castaic that the underground heat zone had expanded beyond a plastic cover over the landfill’s surface to try to contain emissions.

Chiquita Canyon residents seek state relief

Steven Howse, 50, is one of the residents who’s accepted the company’s funds. He told the Assembly Revenue and Taxation Committee that the money helped make life somewhat more bearable for his family, whose home is just 1,600 feet from the 53-year-old landfill that stopped trucking in more trash late last year.

Howse’s family, like many of its neighbors, claims the landfill’s emissions have made them sick. He said his wife was recently diagnosed with breast cancer and one of their four children was diagnosed with a rare autoimmune disease. He said he’s constantly battling respiratory illnesses. 

He didn’t tell the committee how much he received, but said he used the cash for upgrades for his home to “harden” it to prepare for wildfires. He also had to upgrade the home’s air conditioning system and buy new air filters and windows to try to keep the stench out. 

“A lot of times we had to leave the area due to the toxins … because it would be so bad at our house,” he said. “We also used the funds to take our RV trailer out of the area or visit family when we just couldn’t take it any longer.”

A person wears a beige gas mask while standing next to other people holding signs that read "LA County shut it down, "Poison" and "Shut it down! Save Valverde."
Richard Humanic, second from left, wears a gas mask while joining fellow residents of Val Verde and Castaic in a protest calling for the closure of Chiquita Canyon Landfill at Hasley Canyon Park in Castaic on Feb. 22, 2024. Photo by Allen J. Schaben, Los Angeles Times via Getty Images

Howse has a job in the film industry, but Schiavo said other low-income residents who qualify for state assistance programs have been bumped up to a higher tax bracket after taking the payments.

“The concern has been that if you take those funds, then do you no longer qualify for CalFresh or Medi-Cal? Does it count against you because of that?” she told the committee. “Are you paying taxes now on this when that money comes in and it goes right out to pay for the costs that are associated with living with this disaster?”

Landfill blaze comes amid wildfire budget challenges

It’s no sure bet that the bill will advance to become law. Last year, Gov. Gavin Newsom vetoed two similar bills that would have exempted victims of three wildfires from paying state income taxes on settlement payments from the companies alleged to have started those fires. 

Learn more about legislators mentioned in this story.

Now the state’s budget priorities are uncertain as officials and lawmakers continue to hash out how to pay for Los Angeles wildfire relief, hostility from the Trump administration and a home insurance and affordability crisis.

The Revenue and Taxation committee didn’t vote for the measure on Monday, instead moving it to the committee’s “suspense file” for further fiscal analysis.

In the meantime, residents aren’t likely to get tax relief from the federal government.

Late last year, then-President Joe Biden signed into law a bill that exempted wildfire settlement payments from federal income taxes, but the landfill’s relief funds don’t count since the Chiquita Canyon Landfill site has never been declared an official state or federal disaster

Meanwhile, residents have filed more than 25,000 complaints to local air quality officials since 2023. The South Coast Air Quality Management District and other state regulators have issued dozens of violation notices. In November, the air district ordered the company to create a webpage that includes real-time air monitoring of smelly or potentially harmful pollutants, including hydrogen sulfide, methane, dimethyl sulfide and volatile organic compounds.

As an example of how residents might be breathing potentially toxic fumes, air quality officials noted early last year that local air monitoring data showed that more than one-third of all readings exceeded state standards for hydrogen sulfide, which the U.S. Environmental Protection Agency says can cause eye irritation, headaches and fatigue, as well as potentially causing cancer or be lethal in highly concentrated doses.

Owner Waste Connections faces citations

In June, the U.S. EPA also cited the landfill company for violating various regulations intended to safeguard human health. The company is facing potential  civil penalties of up to $59,114 for each day of violation.

“EPA cannot comment on ongoing investigations, including assessment of penalties,” EPA spokesperson Joshua Alexander said in an email.

Schiavo said that her night’s stay next to the landfill made it clear to her that residents need to get out of there until the trash stops burning. 

She has also authored Assembly Bill 28, which would secure state help for the residents around the landfill to find new or temporary housing until it stops smoldering. The details of that bill are still being hashed out.

“People are in this terrible situation where they can’t afford to leave because housing is so expensive. Now (after the LA fires), it’s almost impossible,” she told CalMatters. 

“And if you sell, who’s going to want to buy it? Then if you’re leaving, you know, you have this moral dilemma. People are like, ‘I don’t want to sell to someone else and then (what if) they start getting sick or their kids start getting sick?’ It’s this horrible situation. We just have to relocate people out of there right now, until it’s safe for folks to go back.”

Read the full story here.
Photos courtesy of

Like Many Holiday Traditions, Lighting Candles and Fireplaces Is Best Done in Moderation

The warm scents of gingerbread and pine are holiday favorites, but experts warn they can affect indoor air quality

The warm spices in gingerbread, the woodsy aroma of pine and fir trees, and the fruity tang of mulled wine are smells synonymous with the holiday season. Many people enjoy lighting candles, incense and fireplaces in their homes to evoke the moods associated with these festive fragrances.Burning scented products may create a cozy ambiance, and in the case of fireplaces, provide light and heat, but some experts want people to consider how doing so contributes to the quality of the air indoors. All flames release chemicals that may cause allergy-like symptoms or contribute to long-term respiratory problems if they are inhaled in sufficient quantities.However, people don't have to stop sitting by the hearth or get rid of products like perfumed candles and essential oil diffusers, said Dr. Meredith McCormack, director of the pulmonary and critical care medicine division at John Hopkins University’s medical school. Instead, she recommends taking precautions to control the pollutants in their homes.“Clean air is fragrance free,” said McCormack, who has studied air quality and lung health for more than 20 years. “If having seasonal scents is part of your tradition or evokes feelings of nostalgia, maybe think about it in moderation.” What to know about indoor air quality People in the Northern Hemisphere tend to spend more time indoors during the end-of-year holidays, when temperatures are colder. Indoor air can be significantly more polluted than outdoor air because pollutants get trapped inside and concentrated without proper ventilation or filtration, according to the American Lung Association.For example, active fireplaces and gas appliances release tiny airborne particles that can get into the lungs and chemicals like nitrogen dioxide, a major component of smog, according to the U.S. Environmental Protection Agency. Cleaning products, air fresheners and candles also emit air pollutants at varying concentrations.The risk fragrances and other air pollutants may pose to respiratory health depends on the source, the length and intensity of a person’s exposure, and individual health, McCormack said.It is also important to note that some pollutants have no smell, so unscented products still can affect indoor air quality, experts say. Some people are more vulnerable Polluted air affects everyone but not equally. Children, older adults, minority populations and people of low socioeconomic status are more likely to be affected by poor air quality because of either physiological vulnerabilities or higher exposure, according to the environmental agency.Children are more susceptible to air pollution because of their lung size, which means they get a greater dose of exposure relative to their body size, McCormack said. Pollutants inside the home also post a greater hazard to people with heart or lung conditions, including asthma, she said.Signs of respiratory irritation include coughing, shortness of breath, headaches, a runny nose and sneezing. Experts advise stopping use of pollutant-releasing products or immediately ventilating rooms if symptoms occur.“The more risk factors you have, the more harmful air pollution or poor air quality indoors can be,” McCormack said. Practical precautions to take Ellen Wilkowe burns candles with scents like vanilla and cinnamon when she does yoga, writes or when she is showering at her home in New Jersey. Her teenage daughter, on the other hand, likes more seasonally scented candles like gingerbread.“The candle has a calming presence. They are also very symbolic and used in rituals and many religions,” she said.Wilkowe said she leans toward candles made with soy-based waxes instead of petroleum-based paraffin. Experts note that all lit candles give off air pollutants regardless of what they are made of.Buying products with fewer ingredients, opening windows if the temperatures allow, and using air purifiers with HEPA filters are ways to reduce exposure to any pollutants from indoor fireplaces, appliances and candle displays, McCormack said. She also recommends switching on kitchen exhaust fans before starting a gas-powered stovetop and using the back burners so the vent can more easily suck up pollutants.Setting polite boundaries with guests who smoke cigarettes or other tobacco products is also a good idea, she said.“Small improvements in air quality can have measurable health benefits," McCormack said. "Similarly to if we exercise and eat a little better, we can be healthier.”Rachael Lewis-Abbott, a member of the Indoor Air Quality Association, an organization for professionals who identify and address air quality problems, said people don't usually notice what they are breathing in until problems like gas leaks or mold develop.“It is out of sight, out of mind,” she said.Copyright 2025 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.Photos You Should See – December 2025

This moss survived in space for 9 months

In an experiment on the outside of the International Space Station, a species of moss survived in space for 9 months. And it could have lasted much longer. The post This moss survived in space for 9 months first appeared on EarthSky.

Meet a spreading earthmoss known as Physcomitrella patens. It’s frequently used as a model organism for studies on plant evolution, development, and physiology. In this image, a reddish-brown sporophyte sits at the top center of a leafy gametophore. This capsule contains numerous spores inside. Scientists tested samples like these on the outside of the International Space Station (ISS) to see if they could tolerate the extreme airless environment. And they did. The moss survived in space for 9 months and could have lasted even longer. Image via Tomomichi Fujita/ EurekAlert! (CC BY-SA). Space is a deadly environment, with no air, extreme temperature swings and harsh radiation. Could any life survive there? Reasearchers in Japan tested a type of moss called spreading earthmoss on the exterior of the International Space Station. The moss survived for nine months, and the spores were still able to reproduce when brought back to Earth. Moss survived in space for 9 months Can life exist in space? Not simply on other planets or moons, but in the cold, dark, airless void of space itself? Most organisms would perish almost immediately, to be sure. But researchers in Japan recently experimented with moss, with surprising results. They said on November 20, 2025, that more than 80% of their moss spores survived nine months on the outside of the International Space Station. Not only that, but when brought back to Earth, they were still capable of reproducing. Nature, it seems, is even tougher than we thought! Amazingly, the results show that some primitive plants – not even just microorganisms – can survive long-term exposure to the extreme space environment. The researchers published their peer-reviewed findings in the journal iScience on November 20, 2025. A deadly environment for life Space is a horrible place for life. The lack of air, radiation and extreme cold make it pretty much unsurvivable for life as we know it. As lead author Tomomichi Fujita at Hokkaido University in Japan stated: Most living organisms, including humans, cannot survive even briefly in the vacuum of space. However, the moss spores retained their vitality after nine months of direct exposure. This provides striking evidence that the life that has evolved on Earth possesses, at the cellular level, intrinsic mechanisms to endure the conditions of space. This #moss survived 9 months directly exposed to the vacuum space and could still reproduce after returning to Earth. ? ? spkl.io/63322AdFrpTomomichi Fujita & colleagues@cp-iscience.bsky.social — Cell Press (@cellpress.bsky.social) 2025-11-24T16:00:02.992Z What about moss? Researchers wanted to see if any Earthly life could survive in space’s deadly environment for the long term. To find out, they decided to do some experiments with a type of moss called spreading earthmoss, or Physcomitrium patens. The researchers sent hundreds of sporophytes – encapsulated moss spores – to the International Space Station in March 2022, aboard the Cygnus NG-17 spacecraft. They attached the sporophyte samples to the outside of the ISS, where they were exposed to the vacuum of space for 283 days. By doing so, the samples were subjected to high levels of UV (ultraviolet) radiation and extreme swings of temperature. The samples later returned to Earth in January 2023. The researchers tested three parts of the moss. These were the protonemata, or juvenile moss; brood cells, or specialized stem cells that emerge under stress conditions; and the sporophytes. Fujita said: We anticipated that the combined stresses of space, including vacuum, cosmic radiation, extreme temperature fluctuations and microgravity, would cause far greater damage than any single stress alone. Astronauts placed the moss samples on the outside of the International Space Station for the 9-month-long experiment. Incredibly, more than 80% of the the encapsulated spores survived the trip to space and back to Earth. Image via NASA/ Roscosmos. The moss survived! So, how did the moss do? The results were mixed, but overall showed that the moss could survive in space. The radiation was the most difficult aspect of the space environment to withstand. The sporophytes were the most resilient. Incredibly, they were able to survive and germinate after being exposed to -196 degrees Celsius (-320 degrees Fahrenheit) for more than a week. At the other extreme, they also survived in 55° degrees C (131 degrees F) heat for a month. Some brood cells survived as well, but the encased spores were about 1,000 times more tolerant to the UV radiation. On the other hand, none of the juvenile moss survived the high UV levels or the extreme temperatures. Samples of moss spores that germinated after their 9-month exposure to space. Image via Dr. Chang-hyun Maeng/ Maika Kobayashi/ EurekAlert!. (CC BY-SA). How did the spores survive? So why did the encapsulated spores do so well? The researchers said the natural structure surrounding the spore itself helps to protect the spore. Essentially, it absorbs the UV radiation and surrounds the inner spore both physically and chemically to prevent damage. As it turns out, this might be associated with the evolution of mosses. This is an adaptation that helped bryophytes – the group of plants to which mosses belong – to make the transition from aquatic to terrestrial plants 500 million years ago. Overall, more than 80% of the spores survived the journey to space and then back to Earth. And only 11% were unable to germinate after being brought back to the lab on Earth. That’s impressive! In addition, the researchers also tested the levels of chlorophyll in the spores. After the exposure to space, the spores still had normal amounts of chlorophyll, except for chlorophyll a specifically. In that case, there was a 20% reduction. Chlorophyll a is used in oxygenic photosynthesis. It absorbs the most energy from wavelengths of violet-blue and orange-red light. Tomomichi Fujita at Hokkaido University in Japan is the lead author of the new study about moss in space. Image via Hokkaido University. Spores could have survived for 15 years The time available for the experiment was limited to the several months. However, the researchers wondered if the moss spores could have survived even longer. And using mathematical models, they determined the spores would likely have continued to live in space for about 15 years, or 5,600 days, altogether. The researchers note this prediction is a rough estimate. More data would still be needed to make that assessment even more accurate. So the results show just how resilient moss is, and perhaps some other kinds of life, too. Fujita said: This study demonstrates the astonishing resilience of life that originated on Earth. Ultimately, we hope this work opens a new frontier toward constructing ecosystems in extraterrestrial environments such as the moon and Mars. I hope that our moss research will serve as a starting point. Bottom line: In an experiment on the outside of the International Space Station, a species of moss survived in space for nine months. And it could have lasted much longer. Source: Extreme environmental tolerance and space survivability of the moss, Physcomitrium patens Via EurekAlert! Read more: This desert moss could grow on Mars, no greenhouse needed Read more: Colorful life on exoplanets might be lurking in cloudsThe post This moss survived in space for 9 months first appeared on EarthSky.

Medical Imaging Contributing To Water Pollution, Experts Say

By Dennis Thompson HealthDay ReporterTHURSDAY, Dec. 11, 2025 (HealthDay News) — Contrast chemicals injected into people for medical imaging scans...

By Dennis Thompson HealthDay ReporterTHURSDAY, Dec. 11, 2025 (HealthDay News) — Contrast chemicals injected into people for medical imaging scans are likely contributing to water pollution, a new study says.Medicare patients alone received 13.5 billion milliliters of contrast media between 2011 and 2024, and those chemicals wound up in waterways after people excreted them, researchers recently reported in JAMA Network Open.“Contrast agents are necessary for effective imaging, but they don’t disappear after use,” said lead researcher Dr. Florence Doo, an assistant professor at the University of Maryland Medical Intelligent Imaging Center in Baltimore.“Iodine and gadolinium are non-renewable resources that can enter wastewater and accumulate in rivers, oceans and even drinking water,” Doo said in a news release.People undergoing X-ray or CT scans are sometimes given iodine or barium-sulfate compounds that cause certain tissues, blood vessels or organs to light up, allowing radiologists a better look at potential health problems.For MRI scans, radiologists use gadolinium, a substance that alters the magnetic properties of water molecules in the human body.These are critical for diagnosing disease, but they are also persistent pollutants, researchers said in background notes. They aren’t biodegradable, and conventional wastewater treatment doesn’t fully remove them.For the new study, researchers analyzed 169 million contrast-enhanced imaging procedures that Medicare covered over 13 years.Iodine-based contrast agents accounted for more than 95% of the total volume, or nearly 12.9 billion milliliters. Of those, agents used in CT scans of the abdomen and pelvis alone contributed 4.4 billion milliliters.Gadolinium agents were less frequently used, but still contributed nearly 600 million milliliters, researchers said. Brain MRIs were the most common scan using these contrast materials.Overall, just a handful of procedures accounted for 80% of all contrast use, researchers concluded.“Our study shows that a small number of imaging procedures drive the majority of contrast use. Focusing on those highest-use imaging types make meaningful changes tractable and could significantly reduce health care’s environmental footprint,” researcher Elizabeth Rula, executive director of the Harvey L. Neiman Health Policy Institute in Reston, Va., said in a news release.Doctors can help by making sure their imaging orders are necessary, while radiologists can lower the doses of contrast agents by basing them on a patient’s weight, researchers said.Biodegradable contrast media are under development, researchers noted. Another solution could involve AI, which might be able to accurately analyze medical imaging scans even if less contrast media is used.“We can’t ignore the environmental consequences of medical imaging,” Doo said. “Stewardship of contrast agents is a measurable and impactful way to align patient care with planetary health and should be an important part of broader health care sustainability efforts.”SOURCES: Harvey L. Neiman Health Policy Institute, news release, Dec. 4, 2025; JAMA Network Open, Dec. 5, 2025Copyright © 2025 HealthDay. All rights reserved.

Cars to AI: How new tech drives demand for specialized materials

Generative artificial intelligence has become widely accepted as a tool that increases productivity. Yet the technology is far from mature. Large language models advance rapidly from one generation to the next, and experts can only speculate how AI will affect the workforce and people’s daily lives. As a materials scientist, I am interested in how materials and the technologies that derive from them affect society. AI is one example of a technology driving global change—particularly through its demand for materials and rare minerals. But before AI evolved to its current level, two other technologies exemplified the process created by the demand for specialized materials: cars and smartphones. Often, the mass adoption of a new invention changes human behavior, which leads to new technologies and infrastructures reliant upon the invention. In turn, these new technologies and infrastructures require new or improved materials—and these often contain critical minerals: those minerals that are both essential to the technology and strain the supply chain. The unequal distribution of these minerals gives leverage to the nations that produce them. The resulting power shifts strain geopolitical relations and drive the search for new mineral sources. New technology nurtures the mining industry. The car and the development of suburbs At the beginning of the 20th century, only 5 out of 1,000 people owned a car, with annual production around a few thousand. Workers commuted on foot or by tram. Within a 2-mile radius, many people had all they needed: from groceries to hardware, from school to church, and from shoemakers to doctors. Then, in 1913, Henry Ford transformed the industry by inventing the assembly line. Now, a middle class family could afford a car: Mass production cut the price of the Model T from US$850 in 1908 to $360 in 1916. While the Great Depression dampened the broad adoption of the car, sales began to increase again after the end of World War II. With cars came more mobility, and many people moved farther away from work. In the 1940s and 1950s, a powerful highway lobby that included oil, automobile, and construction interests promoted federal highway and transportation policies, which increased automobile dependence. These policies helped change the landscape: Houses were spaced farther apart, and located farther away from the urban centers where many people worked. By the 1960s, two-thirds of American workers commuted by car, and the average commute had increased to 10 miles. Public policy and investment favored suburbs, which meant less investment in city centers. The resulting decay made living in downtown areas of many cities undesirable and triggered urban renewal projects. Long commutes added to pollution and expenses, which created a demand for lighter, more fuel-efficient cars. But building these required better materials. In 1970, the entire frame and body of a car was made from one steel type, but by 2017, 10 different, highly specialized steels constituted a vehicle’s lightweight form. Each steel contains different chemical elements, such as molybdenum and vanadium, which are mined only in a few countries. While the car supply chain was mostly domestic until the 1970s, the car industry today relies heavily on imports. This dependence has created tension with international trade partners, as reflected by higher tariffs on steel. The cellphone and American life The cellphone presents another example of a technology creating a demand for minerals and affecting foreign policy. In 1983, Motorola released the DynaTAC, the first commercial cellular phone. It was heavy, expensive, and its battery lasted for only half an hour, so few people had one. Then in 1996, Motorola introduced the flip phone, which was cheaper, lighter, and more convenient to use. The flip phone initiated the mass adoption of cellphones. However, it was still just a phone: Unlike today’s smartphones, all it did was send and receive calls and texts. In 2007, Apple redefined communication with the iPhone, inventing the touchscreen and integrating an internet navigator. The phone became a digital hub for navigating, finding information, and building an online social identity. Before smartphones, mobile phones supplemented daily life. Now, they structure it. In 2000, fewer than half of American adults owned a cellphone, and nearly all who did used it only sporadically. In 2024, 98% of Americans over the age of 18 reported owning a cellphone, and over 90% owned a smartphone. Without the smartphone, most people cannot fulfill their daily tasks. Many individuals now experience nomophobia: They feel anxious without a cellphone. Around three-quarters of all stable elements are represented in the components of each smartphone. These elements are necessary for highly specialized materials that enable touchscreens, displays, batteries, speakers, microphones, and cameras. Many of these elements are essential for at least one function and have an unreliable supply chain, which makes them critical. Critical materials and AI Critical materials give leverage to countries that have a monopoly in mining and processing them. For example, China has gained increased power through its monopoly on rare earth elements. In April 2025, in response to U.S. tariffs, China stopped exporting rare earth magnets, which are used in cellphones. The geopolitical tensions that resulted demonstrate the power embodied in the control over critical minerals. The mass adoption of AI technology will likely change human behavior and bring forth new technologies, industries, and infrastructure on which the U.S. economy will depend. All of these technologies will require more optimized and specialized materials and create new material dependencies. By exacerbating material dependencies, AI could affect geopolitical relations and reorganize global power. America has rich deposits of many important minerals, but extraction of these minerals comes with challenges. Factors including slow and costly permitting, public opposition, environmental concerns, high investment costs, and an inadequate workforce all can prevent mining companies from accessing these resources. The mass adoption of AI is already adding pressure to overcome these factors and to increase responsible domestic mining. While the path from innovation to material dependence spanned a century for cars and a couple of decades for cellphones, the rapid advancement of large language models suggests that the scale will be measured in years for AI. The heat is already on. Peter Müllner is a distinguished professor in materials science and engineering at Boise State University. This article is republished from The Conversation under a Creative Commons license. Read the original article.

Generative artificial intelligence has become widely accepted as a tool that increases productivity. Yet the technology is far from mature. Large language models advance rapidly from one generation to the next, and experts can only speculate how AI will affect the workforce and people’s daily lives. As a materials scientist, I am interested in how materials and the technologies that derive from them affect society. AI is one example of a technology driving global change—particularly through its demand for materials and rare minerals. But before AI evolved to its current level, two other technologies exemplified the process created by the demand for specialized materials: cars and smartphones. Often, the mass adoption of a new invention changes human behavior, which leads to new technologies and infrastructures reliant upon the invention. In turn, these new technologies and infrastructures require new or improved materials—and these often contain critical minerals: those minerals that are both essential to the technology and strain the supply chain. The unequal distribution of these minerals gives leverage to the nations that produce them. The resulting power shifts strain geopolitical relations and drive the search for new mineral sources. New technology nurtures the mining industry. The car and the development of suburbs At the beginning of the 20th century, only 5 out of 1,000 people owned a car, with annual production around a few thousand. Workers commuted on foot or by tram. Within a 2-mile radius, many people had all they needed: from groceries to hardware, from school to church, and from shoemakers to doctors. Then, in 1913, Henry Ford transformed the industry by inventing the assembly line. Now, a middle class family could afford a car: Mass production cut the price of the Model T from US$850 in 1908 to $360 in 1916. While the Great Depression dampened the broad adoption of the car, sales began to increase again after the end of World War II. With cars came more mobility, and many people moved farther away from work. In the 1940s and 1950s, a powerful highway lobby that included oil, automobile, and construction interests promoted federal highway and transportation policies, which increased automobile dependence. These policies helped change the landscape: Houses were spaced farther apart, and located farther away from the urban centers where many people worked. By the 1960s, two-thirds of American workers commuted by car, and the average commute had increased to 10 miles. Public policy and investment favored suburbs, which meant less investment in city centers. The resulting decay made living in downtown areas of many cities undesirable and triggered urban renewal projects. Long commutes added to pollution and expenses, which created a demand for lighter, more fuel-efficient cars. But building these required better materials. In 1970, the entire frame and body of a car was made from one steel type, but by 2017, 10 different, highly specialized steels constituted a vehicle’s lightweight form. Each steel contains different chemical elements, such as molybdenum and vanadium, which are mined only in a few countries. While the car supply chain was mostly domestic until the 1970s, the car industry today relies heavily on imports. This dependence has created tension with international trade partners, as reflected by higher tariffs on steel. The cellphone and American life The cellphone presents another example of a technology creating a demand for minerals and affecting foreign policy. In 1983, Motorola released the DynaTAC, the first commercial cellular phone. It was heavy, expensive, and its battery lasted for only half an hour, so few people had one. Then in 1996, Motorola introduced the flip phone, which was cheaper, lighter, and more convenient to use. The flip phone initiated the mass adoption of cellphones. However, it was still just a phone: Unlike today’s smartphones, all it did was send and receive calls and texts. In 2007, Apple redefined communication with the iPhone, inventing the touchscreen and integrating an internet navigator. The phone became a digital hub for navigating, finding information, and building an online social identity. Before smartphones, mobile phones supplemented daily life. Now, they structure it. In 2000, fewer than half of American adults owned a cellphone, and nearly all who did used it only sporadically. In 2024, 98% of Americans over the age of 18 reported owning a cellphone, and over 90% owned a smartphone. Without the smartphone, most people cannot fulfill their daily tasks. Many individuals now experience nomophobia: They feel anxious without a cellphone. Around three-quarters of all stable elements are represented in the components of each smartphone. These elements are necessary for highly specialized materials that enable touchscreens, displays, batteries, speakers, microphones, and cameras. Many of these elements are essential for at least one function and have an unreliable supply chain, which makes them critical. Critical materials and AI Critical materials give leverage to countries that have a monopoly in mining and processing them. For example, China has gained increased power through its monopoly on rare earth elements. In April 2025, in response to U.S. tariffs, China stopped exporting rare earth magnets, which are used in cellphones. The geopolitical tensions that resulted demonstrate the power embodied in the control over critical minerals. The mass adoption of AI technology will likely change human behavior and bring forth new technologies, industries, and infrastructure on which the U.S. economy will depend. All of these technologies will require more optimized and specialized materials and create new material dependencies. By exacerbating material dependencies, AI could affect geopolitical relations and reorganize global power. America has rich deposits of many important minerals, but extraction of these minerals comes with challenges. Factors including slow and costly permitting, public opposition, environmental concerns, high investment costs, and an inadequate workforce all can prevent mining companies from accessing these resources. The mass adoption of AI is already adding pressure to overcome these factors and to increase responsible domestic mining. While the path from innovation to material dependence spanned a century for cars and a couple of decades for cellphones, the rapid advancement of large language models suggests that the scale will be measured in years for AI. The heat is already on. Peter Müllner is a distinguished professor in materials science and engineering at Boise State University. This article is republished from The Conversation under a Creative Commons license. Read the original article.

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