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Reçu aujourd’hui — 19 mai 2025

European 'Green' Investments Hold Billions in Fossil Fuel Majors

Par :msmash
19 mai 2025 à 19:30
An anonymous reader shares a report: European "green" funds holding more than $33 billion of investments in major oil and gas companies have been revealed by an investigation, despite fossil fuels being the root cause of the climate crisis. Some of these investment funds used branding such as Sustainable Global Stars and Europe Climate Pathway. Over $18 billion was invested in the five biggest polluters: TotalEnergies, Shell, ExxonMobil, Chevron and BP. These topped a 2023 Carbon Majors ranking for oil and gas production among shareholder-owned firms. Other investments by funds following EU sustainable finance disclosure regulations (SFDR) included those in US fracking company Devon Energy and Canadian tar sands company Suncor, the investigation by Voxeurop and the Guardian found. Investors claim that holding a stake in a company allows them to influence the firm's pursuit of climate goals. However, no major oil and gas producer has plans consistent with international climate targets and many companies have weakened their plans in the last year, according to a report from Carbon Tracker in April. The investment firms with the biggest stakes in fossil companies in their green funds were JP Morgan, BlackRock and DWS in Germany.

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The Most Promising Ways to Destroy 'Forever Chemicals'

17 mai 2025 à 18:34
"Researchers are seeking a breakthrough in technologies to tackle PFAS contamination," reports the Washington Post — including experiments with ultraviolet light, plasma and sound waves: "We're in a good spot," said Christopher Higgins, a professor of civil and environmental engineering at the Colorado School of Mines who researches PFAS. "There's a lot of things being tested. ... Around the world, everyone is trying to work on this topic...." PFAS destruction technologies are beginning to show potential. Some methods have been licensed by companies that are rolling out the systems in real-world settings. "There's been a lot of research happening over the past few years looking at advanced destruction technologies, and there's been a lot of improvements and advancements, and we're now starting to see some of them actually at scale," said Anna Reade [a senior scientist and director of PFAS advocacy at the Natural Resources Defense Council]. An approach known as supercritical water oxidation is one of the more developed technologies, Reade and other experts said. It involves heating and pressurizing water to a specific point that creates the ideal conditions to break every carbon fluorine bond, said Amy Dindal [a PFAS expert with Battelle, a science and technology nonprofit that has developed a PFAS destruction technology]. The process used in a patented technology created by Battelle produces carbon dioxide and a form of fluorine that can be quickly neutralized to become a harmless salt. "It's a complete destruction and mineralization technology, because we're actually breaking all of the carbon fluorine bonds," Dindal said, adding that the technology is "PFAS agnostic...." Another promising approach using heat and pressure was developed by researchers at the Colorado School of Mines [and already licensed by a company in Washington]. Known as hydrothermal alkaline treatment, or HALT, it involves adding a low-cost chemical reagent such as sodium hydroxide to superheated liquid water.... A destruction method that harnesses ultraviolet light has also emerged as a contender [has licensed by a company in Michigan]. When UV light oxidizes an electron-generating compound, it produces a powerful electron that's very reactive and strong enough to break carbon fluorine bonds... Other technologies are experimenting with the use of plasma, which can generate reactive electrons to break down PFAS but tends to require a large amount of energy. Researchers are also experimenting with a process that uses sound waves. High-intensity sound waves create small bubbles in a water system or liquid waste stream, Higgins said. As those bubbles collapse, they can generate the high temperatures and pressure needed to degrade PFAS. But "At the end of the day, not using these chemicals unless it's absolutely necessary is the actually most effective tool in our toolbox," Reade said.

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Clean Energy Just Put China's CO2 Emissions Into Reverse For First Time

Par :msmash
16 mai 2025 à 14:00
For the first time, the growth in China's clean power generation has caused the nation's carbon dioxide emissions to fall despite rapid power demand growth. From a report:The new analysis for Carbon Brief shows that China's emissions were down 1.6% year-on-year in the first quarter of 2025 and by 1% in the latest 12 months. Electricity supply from new wind, solar and nuclear capacity was enough to cut coal-power output even as demand surged, whereas previous falls were due to weak growth. The analysis, based on official figures and commercial data, shows that China's CO2 emissions have now been stable, or falling, for more than a year. However, they remain only 1% below the latest peak, implying that any short-term jump could cause China's CO2 emissions to rise to a new record.

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Quand sort Alien : Earth, la série événement de Disney+ ?

14 mai 2025 à 10:11

Avis aux fans d'Alien : la toute première série située dans l'univers de la saga sera très bientôt dévoilée sur Disney+. Casting, date de sortie, bande-annonce... Voici tout ce que l'on sait déjà sur Alien : Earth.

Climate Crisis Threatens the Banana, the World's Most Popular Fruit

Par :msmash
12 mai 2025 à 16:00
The climate crisis is threatening the future of the world's most popular fruit, as almost two-thirds of banana-growing areas in Latin America and the Caribbean may no longer be suitable for growing the fruit by 2080, new research has found. From a report: Rising temperatures, extreme weather and climate-related pests are pummeling banana-growing countries such as Guatemala, Costa Rica and Colombia, reducing yields and devastating rural communities across the region, according to Christian Aid's new report, Going Bananas: How Climate Change Threatens the World's Favourite Fruit. Bananas are the world's most consumed fruit -- and the fourth most important food crop globally, after wheat, rice and maize. About 80% of bananas grown globally are for local consumption, and more than 400 million people rely on the fruit for 15% to 27% of their daily calories.

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Sea Levels Rose Faster Than Expected Last Year. Blame Global Warming - But What Happens Next?

10 mai 2025 à 19:34
Though global sea levels "varied little" for the 2,000 years before the 20th century, CNN reports that sea levels then "started rising and have not stopped since — and the pace is accelerating." And sea level rise "was unexpectedly high last year, according to a recent NASA analysis of satellite data." More concerning, however, is the longer-term trend. The rate of annual sea level rise has more than doubled over the past 30 years, resulting in the global sea level increasing 4 inches since 1993. "It's like we're putting our foot on the gas pedal," said Benjamin Hamlington, a research scientist in the Sea Level and Ice Group at NASA's Jet Propulsion Laboratory. While other climate signals fluctuate, global sea level has a "persistent rise," he told CNN. It spells trouble for the future. Scientists have a good idea how much average sea level will rise by 2050 — around 6 inches globally, and as much as 10 to 12 inches in the US. Past 2050, however, things get very fuzzy. "We have such a huge range of uncertainty," said Dirk Notz, head of sea ice at the University of Hamburg. "The numbers are just getting higher and higher and higher very quickly." The world could easily see an extra 3 feet of sea level rise by 2100, he told CNN; it could also take hundreds of years to reach that level. Scientists simply don't know enough yet to project what will happen. What scientists are crystal clear about is the reason for the rise: human-caused global warming. Oceans absorb roughly 90% of the excess heat primarily produced by burning fossil fuels, and as water heats up it expands. Heat in the oceans and atmosphere is also driving melting of the Greenland and Antarctic ice sheets, which together hold enough fresh water to raise global sea levels by around 213 feet. Melting ice sheets have driven roughly two-thirds of longer-term sea level rise, although last year — the planet's hottest on record — the two factors flipped, making ocean warming the main driver. [SciTechDaily reports that between 2021 and 2023 the Antarctica ice sheet actually showed an overall increase in mass which exerted a negative contribution to sea level rise.] It's likely that an increase of about 3 feet is already locked in, Notz said, because "we have pushed the system too hard." The big question is, how quickly will it happen? Ice sheets are the biggest uncertainty, as it's not clear how fast they'll react as the world heats up — whether they'll melt steadily or reach a tipping point and rapidly collapse... [I]t's still unclear how processes may unfold over the next decades and centuries. Antarctica is "the elephant in the room," he said. Alarming changes are unfolding on this vast icy continent, which holds enough water to raise levels by 190 feet. Notz describes the ice sheet as an "awakening giant:" It takes a long time to wake up but once awake, "it's very, very difficult to put it back to sleep." The article notes that U.S. coastlines "are tracking above global average and toward the upper end of climate model projections, NASA's Hamlington said." (The state of Louisiana has one of the highest rates of land loss in the world, with some places experiencing nearly 4x the global rate of relative sea level rise.) But it's not just a problem for America. "Over the next three decades, islands such as Tuvalu, Kiribati and Fiji will experience at least 6 inches of sea level rise even if the world reduces planet-heating pollution, according to NASA.... "Entire villages in Fiji have been formally relocated," said Fijian activist George Nacewa, from climate group 350.org, "the incoming tides are flooding our roads and inundating our crops." However, if the pace accelerates rapidly, "it will be very, very difficult to adapt to, because things unfold too quickly," he said. "Humans still have control over how fast sea level rises over the next decades and centuries by cutting emissions, Notz noted." Thanks to long-time Slashdot reader RoccamOccam for sharing the news.

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Scientists Have Explored Just 0.001% of Deep Ocean Floor, New Study Finds

Par :msmash
9 mai 2025 à 18:00
A comprehensive analysis in Science Advances reveals that humans have explored less than 0.001% of the deep seafloor -- an area equivalent to merely one-tenth the size of Belgium. Oceanographer Katherine Bell and colleagues at the Ocean Discovery League compiled data from approximately 44,000 deep-sea dives conducted between 1958 and 2024, finding that expeditions have concentrated overwhelmingly around waters near the United States, Japan, and New Zealand. The study exposes significant gaps in ocean exploration, with vast regions -- particularly the Indian Ocean -- remaining virtually untouched by direct observation. Much of the existing dive data remains inaccessible to scientists, locked away by private companies.

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It Could Be a $250 Billion Market, But Almost No One Is Interested

Par :msmash
29 avril 2025 à 18:10
Carbon removal technologies, potentially a $250 billion market, are failing to gain traction as buyers remain scarce. The Intergovernmental Panel on Climate Change projects a need for 10 billion metric tons of carbon removals annually by 2050, yet only 175 million tons have been sold to date -- less than 2% of requirements. Microsoft dominates the market, accounting for 35% of all purchases and 76% of engineered removal solutions specifically. The market suffers from significant barriers: unproven technologies, vast price disparities ($80 per ton for forest projects versus $1,000 for direct air capture), and lack of standardization. Industry experts at a recent London gathering concluded that without more buyers willing to accept early adoption risks, the market cannot meaningfully grow.

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Tout ce que Disney+ a dévoilé sur Alien : Earth, la série événement

29 avril 2025 à 09:45

Avis aux fans d'Alien : la toute première série située dans l'univers de la saga sera très bientôt dévoilée sur Disney+. Casting, sortie, bande-annonce... Voici tout ce que l'on sait déjà sur Alien : Earth.

XPrize In Carbon Removal Goes To Enhanced Rock Weathering

Par :BeauHD
26 avril 2025 à 13:00
An anonymous reader quotes a report from IEEE Spectrum: The XPrize Foundation today announced the winners of its four-year, $100 million XPrize competition in carbon removal. The contest is one of dozens hosted by the foundation in its 20-year effort to encourage technological development. Contestants in the carbon removal XPrize had to demonstrate ways to pull carbon dioxide from the atmosphere or oceans and sequester it sustainably. Mati Carbon, a Houston-based startup developing a sequestration technique called enhanced rock weathering, won the grand prize of $50 million. The company spreads crushed basalt on small farms in India and Africa. The silica-rich volcanic rock improves the quality of the soil for the crops but also helps remove carbon dioxide from the air. It does this by reacting with dissolved CO2 in the soil's water, turning it into bicarbonate ions and preventing it from returning to the atmosphere. More than a dozen organizations globally are developing enhanced rock weathering approaches at an industrial scale, but Mati's tech-heavy verification and software platform caught the XPrize judges' attention. "On the one hand, they're moving rocks around in trucks—that's not very techy. But when we looked under the hood... what we saw was a very impressive data-collection exercise," says Michael Leitch, XPrize's technical lead for the competition. Here's a list of the runners-up: - Paris-based NetZero won $15 million for turning agricultural waste into biochar through pyrolysis, a method that locks carbon into a stable, solid form. - Houston-based Vaulted Deep won $8 million for geologically sequestering carbon-rich organic waste by injecting it deep underground. - London-based Undo Carbon won $5 million for its enhanced rock weathering approach, spreading silicate minerals to speed up natural carbon removal. Additionally, Project Hajar and Planetary Technologies each received $1 million honorary XFactor prizes, recognizing their promising work in direct air capture and ocean carbon removal, despite not meeting the competition's 1,000-tonne removal threshold.

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India's Delhi Plans To Curb Gasoline Car Sales, Ban Gas-Guzzling Bikes To Shed Polluter Tag

Par :msmash
24 avril 2025 à 20:14
India's capital New Delhi plans to limit gasoline and diesel-powered cars a family can buy as well as ban sales of fuel-guzzling motorbikes and scooters, according to a draft policy aimed at cleaning up one of the world's most polluted cities. From a report: The measures represent one of the most drastic steps the city has lined up to tackle pollution, which often forces local authorities to ban some construction, shut schools and disrupt flights in the city of more than 30 million people during the winter season. Under Delhi's new electric vehicle policy, the city government will also waive some local taxes on the purchase of hybrids, putting them on par with concessions given to EVs, while imposing a new levy of 0.5 rupees ($0.0059) on every litre of petrol sales, according to the 74-page draft seen by Reuters. The primary objective "is to unlock the next phase of EV adoption, reduce air pollution and contribute to India's energy independence and net-zero targets," the draft stated.

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Even the US Government Says AI Requires Massive Amounts of Water

Par :msmash
24 avril 2025 à 16:02
A Government Accountability Office report released this week reveals generative AI systems consume staggering amounts of water, with 250 million daily queries requiring over 1.1 million gallons -- all while companies provide minimal transparency about resource usage. The 47-page analysis [PDF] found cooling data centers -- which demand between 100-1000 megawatts of power -- constitutes 40% of their energy consumption, a figure expected to rise as global temperatures increase. Water usage varies dramatically by location, with geography significantly affecting both water requirements and carbon emissions. Meta's Llama 3.1 405B model has generated 8,930 metric tons of carbon, compared to Google's Gemma2 at 1,247.61 metric tons and OpenAI's GPT3 at 552 metric tons. The report confirms generative AI searches cost approximately ten times more than standard keyword searches. The GAO asserted about persistent transparency problems across the industry, noting these systems remain "black boxes" even to their designers.

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Scientists Say They Can Calculate the Cost of Oil Giants' Role In Global Warming

Par :BeauHD
24 avril 2025 à 13:00
An anonymous reader quotes a report from the Washington Post: Oil and gas companies are facing hundreds of lawsuits around the world testing whether they can be held responsible for their role in causing climate change. Now, two scientists say they've built a tool that can calculate how much damage each company's planet-warming pollution has caused -- and how much money they could be forced to pay if they're successfully sued. Collectively, greenhouse emissions from 111 fossil fuel companies caused the world $28 trillion in damage from extreme heat from 1991 to 2020, according to a paper published Wednesday in Nature. The new analysis could fuel an emerging legal fight.The authors, Dartmouth associate professor Justin Mankin and Chris Callahan, a postdoctoral researcher at Stanford University, say their model can determine a specific company's share of responsibility over any time period. [...] Callahan and Mankin's work combines all of these steps -- estimating a company's historical emissions, figuring out how much those emissions contributed to climate change and calculating how much economic damage climate change has caused -- into one "end-to-end" model that links one polluter's emissions to a dollar amount of economic damage from extreme heat. By their calculation, Saudi Aramco is on the hook for $2.05 trillion in economic losses from extreme heat from 1991 to 2020. Russia's Gazprom is responsible for $2 trillion, Chevron for $1.98 trillion, ExxonMobil for $1.91 trillion and BP for $1.45 trillion. Industry groups and companies tend to object to the methodologies of attribution science. They could seek to contest the assumptions that went into each step of Mankin and Callahan's model. Indeed, every step in that process introduces some room for error, and stringing together all of those steps compounds the uncertainty in the model, according to Delta Merner, lead scientist at theScience Hub for Climate Litigation, which connects scientists and lawyers bringing climate lawsuits. She also mentioned that the researchers relied on a commonly used but simplified climate model known as the Finite Amplitude Impulse Response (FAIR) model. "It is robust for the purpose of what the study is doing," Merner said, "but these models do make assumptions about climate sensitivity, about carbon cycle behavior, energy balance, and all of the simplifications in there do introduce some uncertainty." The exact dollar figures in the paper aren't intended as gospel. But outside scientists said Mankin and Callahan use well-established, peer-reviewed datasets and climate models for every step in their process, and they are transparent about the uncertainty in the numbers.

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More Than 80% of the World's Reefs Hit By Bleaching After Worst Global Event On Record

Par :msmash
23 avril 2025 à 16:40
The world's coral reefs have been pushed into "uncharted territory" by the worst global bleaching event on record that has now hit more than 80% of the planet's reefs, scientists have warned. From a report: Reefs in at least 82 countries and territories have been exposed to enough heat to turn corals white since the global event started in January 2023, the latest data from the US government's Coral Reef Watch shows. Coral reefs are known as the rainforests of the sea because of their high concentration of biodiversity that supports about a third of all marine species and a billion people. But record high ocean temperatures have spread like an underwater wildfire over corals across the Pacific, Atlantic and Indian oceans, damaging and killing countless corals.

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The Quest To Build Islands With Ocean Currents In the Maldives

Par :BeauHD
22 avril 2025 à 03:30
An anonymous reader quotes a report from MIT Technology Review: Arete Glacier Initiative has raised $5 million to improve forecasts of sea-level rise and explore the possibility of refreezing glaciers in place. Off one atoll, just south of the Maldives' capital, Male, researchers are testing one way to capture sand in strategic locations -- to grow islands, rebuild beaches, and protect coastal communities from sea-level rise. Swim 10 minutes out into the En'boodhoofinolhu Lagoon and you'll find the Ramp Ring, an unusual structure made up of six tough-skinned geotextile bladders. These submerged bags, part of a recent effort called the Growing Islands project, form a pair of parentheses separated by 90meters (around 300 feet). The bags, each about two meters tall, were deployed in December 2024, and by February, underwater images showed that sand had climbed about a meter and a half up the surface of each one, demonstrating how passive structures can quickly replenish beaches and, in time, build a solid foundation for new land. "There's just a ton of sand in there. It's really looking good," says Skylar Tibbits, an architect and founder of the MIT Self-Assembly Lab, which is developing the project in partnership with the Male-based climate tech company Invena. The Self-Assembly Lab designs material technologies that can be programmed to transform or "self-assemble" in the air or underwater, exploiting natural forces like gravity, wind, waves, and sunlight. Its creations include sheets of wood fiber that form into three-dimensional structures when splashed with water, which the researchers hope could be used for tool-free flat-pack furniture.Growing Islands is their largest-scale undertaking yet. Since 2017, the project has deployed 10 experiments in the Maldives, testing different materials, locations, and strategies, including inflatable structures and mesh nets. The Ramp Ring is many times larger than previous deployments and aims to overcome their biggest limitation. In the Maldives, the direction of the currents changes with the seasons. Past experiments have been able to capture only one seasonal flow, meaning they lie dormant for months of the year. By contrast, the Ramp Ring is "omnidirectional," capturing sand year-round. "It's basically a big ring, a big loop, and no matter which monsoon season and which wave direction, it accumulates sand in the same area," Tibbits says. The approach points to a more sustainable way to protect the archipelago, whose growing population is supported by an economy that caters to 2 million annual tourists drawn by its white beaches and teeming coral reefs. Most of the country's 187 inhabited islands have already had some form of human intervention to reclaim land or defend against erosion, such as concrete blocks, jetties, and breakwaters.

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Airbus Promised a 'Green' Hydrogen Aircraft. That Bet Is Now Unraveling

20 avril 2025 à 23:16
An anonymous reader shared this report from the Wall Street Journal: Five years ago, Airbus made a bold bet: The plane maker would launch a zero-emissions, hydrogen-powered aircraft within 15 years that, if successful, would mark the biggest revolution in aviation technology since the jet engine. Now, Airbus is pulling the brakes. The company has cut the project's budget by a quarter, reallocated staff and sent remaining engineers back to the drawing board, delaying its plans by as much as a decade... Airbus has spent more than $1.7 billion on the project, according to people familiar with the matter, but over the past year concluded that technical challenges and a slow uptake of hydrogen in the wider economy meant the jet wouldn't be ready by 2035... Airbus says the past five years of work and money haven't been wasted. The company has established that hydrogen is technically feasible and delaying the project will give it more time to fine-tune the technology, executives said... Airbus shifted focus to hydrogen-fuel cells, which use a chemical reaction to generate energy for an electric motor. It would produce only water vapor, but would require a more radical redesign of the airframe and propulsion system. The plane would carry only 100 passengers about 1,000 nautical miles. Over time, even that proved challenging because of the extra weight of the fuel cells and their limited electricity generation. Instead of a short-haul narrow-body — the workhorse of the aviation industry — at best the aircraft would be more akin to a less appealing regional turboprop. Airbus received a multi-billion Covid-era support package from the French government that "required Airbus to spend a portion of the money on bringing green aircraft to market by the 2030s," according to the article. "The hydrogen project helped Airbus access additional government funding, as well as private green financing... Airbus ultimately assigned the project an annual budget of about €400 million, primarily funded through its own coffers, according to people familiar with its financing arrangements."

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The Bees Are Disappearing Again

20 avril 2025 à 17:34
"Honeybee colonies are under siege across much of North America..." reported the New York Times last week. [Alternate URL here.] Last winter beekeepers across America "began reporting massive beehive collapses. More than half of the roughly 2.8 million colonies collapsed, costing the industry about $600 million in economic losses..." America's Department of Agriculture says "sublethal exposure" to pesticides remains one of the biggest factors threatening honeybees, according to the article — but it's one of several threats. "Parasites, loss of habitat, climate change and pesticides threaten to wipe out as much as 70% or more of the nation's honeybee colonies this year, potentially the most devastating loss that the nation has ever seen." Some years are worse than others, but there has been a steady decline over time. Scientists have named the phenomenon colony collapse disorder: Bees simply disappear after they fly out to forage for pollen and nectar. Illness disables their radar, preventing them from finding their way home. The queen and her brood, if they survive, remain defenseless. The precise causes remain unknown. Bee colonies have become even more vulnerable because of the increase in extreme weather conditions, including droughts, heat waves, monster hurricanes, explosive wildfires and floods that have damaged or destroyed the bees and the vegetation they pollinate. If that isn't bad enough, parasites — and other creatures researchers refer to as "biotic" threats that prey on bees — proliferate when there is damage to ecosystems. All that means that the U.S. beekeeping industry has contracted by about 2.9% over the past five years, according to data collected by IBISWorld, a research firm. Annual loss rates have been increasing among all beekeepers over the past decade with the most significant colony collapses in commercial operations happening during the past five years. The article notes that "compounding the troubles for the bee industry are recent federal cuts" proposed by DOGE to America's Department of Agriculture, "where researchers were studying ways to protect the nation's honeybees." And while federal policies like tariffs could make farming more expensive, "Beekeepers also often depend on immigrants to manage their hives and to help produce commercial honey..."

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Is There a Greener Way to Produce Iron?

20 avril 2025 à 16:34
"Using electrochemistry, University of Oregon researchers have developed a way to make iron metal for steel production without burning fossil fuels..." the University of Oregon wrote last year. "Decarbonizing this step would do roughly as much to reduce greenhouse gas emissions as converting every gas-guzzling vehicle on the roads to electric... If scaled up, the process could help decarbonize one of the largest and most emissions-intensive industries worldwide," replacing carbon-spewing industrial blast furnaces. Paul Kempler, their research assistant chemistry professor, added "The reason we got excited about this chemistry, is that our reactants are two things that are very cheap: saltwater and iron oxide." And this week he announced that "We actually have a chemical principle, a sort of guiding design rule, that will teach us how to identify low-cost iron oxides that we could use in these reactors." "Those reactions conveniently also produce chlorine, a commercially valuable byproduct," writes SciTechDaily, in a new follow-up report this week: In their latest study, the researchers focused on improving the process by identifying which types of iron oxides make the reaction more cost-effective, an essential step toward scaling the method for industrial use.... In lab tests, the difference was striking: "With the really porous particles, we can make iron really quickly on a small area," Goldman said. "The dense particles just can't achieve the same rate, so we're limited in how much iron we can make per square meter of electrodes...." To take their process beyond the lab, Kempler's lab is working with researchers in other fields. A collaboration with civil engineers at Oregon State University is helping them better understand what's needed for the product to work in real-world applications. And collaboration with an electrode manufacturing company is helping them address the logistical and scientific challenges of scaling up an electrochemical process. "I think what this work shows is that technology can meet the needs of an industrial society without being environmentally devastating," Goldman said. "We haven't solved all the problems yet, of course, but I think it's an example that serves as a nucleation point for a different way of thinking about what solutions look like. We can continue to have industry and technology and medicine, and we can do it in a way that's clean — and that's awesome!"

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Water on Earth May Not Have Originated from an Asteroid Impact, Study Finds

20 avril 2025 à 14:34
Discover magazine reports that a team of researchers have produced evidence that the ancient building blocks for water have been here on earth "since early in the planet's history, according to a study published in the journal Icarus." Pinpointing when and where Earth's hydrogen [originated] is an essential key to understanding how life arose on the planet. Without hydrogen, there's no water, and without water, life can't exist here. Ironically, researchers turned to a meteorite containing hydrogen to prove that such former bodies did not provide the H2 ingredient of water's H2O recipe. They examined a rare type of meteorite — known as an enstatite chondrite — that was built similarly to early Earth 4.5 billion years ago and the team discovered hydrogen present in the chemical. The logic is that if this material resembling early Earth's composition can contain hydrogen, so too could the young planet.... Since the proto-Earth was made of material similar to enstatite chondrites, by the time the immature planet had grown large enough to be struck by asteroids, it would have already stashed enough hydrogen to explain Earth's present-day water supply.Although this study likely won't resolve the debate over Earth's original water source, it tilts the ta ble toward an internal, not external one. "We now think that the material that built our planet — which we can study using these rare meteorites — was far richer in hydrogen than we thought previously," James Bryson, an Oxford professor and an author of the paper, said in a press release. "This finding supports the idea that the formation of water on Earth was a natural process, rather than a fluke of hydrated asteroids bombarding our planet after it formed."

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Scientists Find Rare Evidence Earth is 'Peeling' Under the Sierra Nevada Mountains

20 avril 2025 à 01:39
"Seismologist Deborah Kilb was wading through California earthquake records from the past four decades when she noticed something odd," reports CNN, "a series of deep earthquakes that had occurred under the Sierra Nevada at a depth where Earth's crust would typically be too hot and high pressure for seismic activity..." Kilb flagged the data to Vera Schulte-Pelkum, a research scientist at the Cooperative Institute for Research in Environmental Sciences and an associate research professor of geological sciences at the University of Colorado Boulder... Using the newfound data, the researchers imaged the Sierra Nevada through a technique known as receiver function analysis, which uses seismic waves to map Earth's internal structure. The scientists found that in the central region of the mountain range, Earth's crust is currently peeling away, a process scientifically known as lithospheric foundering. Kilb and Schulte-Pelkum reported the findings in December in the journal Geophysical Research Letters. The hypothesis lined up with previous speculation that the area had undergone lithospheric foundering, which happens when Earth's outermost layer sinks into the lower layer of the mantle. Now, the study authors believe that the process is ongoing and is currently progressing to the north of the mountain range, according to the study... What's happening under the Sierra Nevada could offer rare insight into how the continents formed, Schulte-Pelkum said. The finding could also help scientists identify more areas where this process is happening as well as provide a better understanding of earthquakes and how our planet operates, she added... Evidence for this process has been hard to come by. It is not visible from above ground, and it's an extremely slow process. Scientists theorize that the south Sierra finished the process of lithospheric foundering about 4 million to 3 million years ago, according to the study. It appears that these natural events happen occasionally around the world, Schulte-Pelkum said. "Geologically speaking, this is a pretty quick process with long periods of stability in between. ... This (lithosphere foundering) probably started happening a long time ago when we started building continents, and (the continents) have gotten bigger over time. So it's just sort of this punctuated, localized thing," she added... Further study within this area could also help scientists better understand how the Earth evolves on long timescales. If the lithospheric foundering continues underneath the mountain range, one can speculate that the land will continue to stretch vertically, changing the way the landscape looks now [said Mitchell McMillan, a research geologist and postdoctoral fellow at Georgia Tech, who was not involved with the study]. But that could take anywhere from several hundred thousand to a few million years, he added.

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