Many of the gravest threats to humanity are drawing closer, as carbon pollution heats the planet to ever more dangerous levels, scientists have warned. From a report: Five important natural thresholds already risk being crossed, according to the Global Tipping Points report, and three more may be reached in the 2030s if the world heats 1.5C (2.7F) above pre-industrial temperatures. Triggering these planetary shifts will not cause temperatures to spiral out of control in the coming centuries but will unleash dangerous and sweeping damage to people and nature that cannot be undone.

"Tipping points in the Earth system pose threats of a magnitude never faced by humanity," said Tim Lenton, from the University of Exeter's Global Systems Institute. "They can trigger devastating domino effects, including the loss of whole ecosystems and capacity to grow staple crops, with societal impacts including mass displacement, political instability and financial collapse." The tipping points at risk include the collapse of big ice sheets in Greenland and the West Antarctic, the widespread thawing of permafrost, the death of coral reefs in warm waters, and the collapse of one atmospheric current in the North Atlantic.

An anonymous reader quotes a report from Axios: Increasingly intensive and frequent wildfires in the western U.S. are deteriorating air quality and causing more premature deaths, a new study found. Fires have damaged federal efforts from the Environmental Protection Agency to improve air quality mainly through reductions in automobile emissions, per the study published Monday in The Lancet Planetary Health. From 2000 to 2020, air quality has worsened in the western U.S. due to wildfires. Black carbon concentrations have risen 55% on an annual basis, mostly due to the wildfires, researchers found. The fires have also caused an increase of 670 premature deaths per year in the region in the two-decade span. Meanwhile, the eastern U.S. had no major declines in air quality during the same time period.

Our air is supposed to be cleaner and cleaner due mostly to EPA regulations on emissions, but the fires have limited or erased these air-quality gains," said Jun Wang, the study's lead corresponding author and chair of the University of Iowa's Department of Chemical and Biochemical Engineering, in a statement. "[A]ll the efforts for the past 20 years by the EPA to make our air cleaner basically have been lost in fire-prone areas and downwind regions," Wang added. "We are losing ground."

[Daniel Swain, a climate scientist at UCLA] said the findings were consistent with other studies that contribute to the same overall picture that after the air quality regulations' great success, "the extremes of those air pollution episodes are actually now increasing again" due to wildfires. "On average, the air quality is still better, but the problem is, it's during these episodes of just-near apocalyptic conditions where we're really losing a lot of ground and that really is because the size and the intensity of wildfires has increased greatly," he said. Given climate change is a wildfire driver, keeping global heating to the lowest level possible will help. "But we're still going to see more warming no matter what moving forward, and so there will be further increases in the wildfire hazard," Swain said.

An anonymous reader shares a report: A little more than three months ago the Indian space agency, ISRO, achieved a major success by putting its Vikram lander safely down on the surface of the Moon. In doing so India became the fourth country to achieve a soft landing on the Moon, and this further ignited the country's interest in space exploration. But it turns out that is not the end of the story for the Chandrayaan 3 mission. In a surprise announcement made Monday, ISRO announced that it has successfully returned the propulsion module used by the spacecraft into a high orbit around Earth. This experimental phase of the mission, the agency said in a statement, tested key capabilities needed for future lunar missions, including the potential for returning lunar rocks to Earth.

The United States has committed to the idea of phasing out coal power plants, joining 56 other nations in kicking the coal habit that's a huge factor in global warming. From a report: U.S. Special Envoy John Kerry announced that America was joining the Powering Past Coal Alliance, which means the Biden Administration commits to building no new coal plants and phasing out existing plants. No date was given for when the existing plants would have to go, but other Biden regulatory actions and international commitments already in the works had meant no coal by 2035.

"We will be working to accelerate unabated coal phase-out across the world, building stronger economies and more resilient communities," Kerry said in a statement. "The first step is to stop making the problem worse: stop building new unabated coal power plants." Coal power plants have already been shutting down across the nation due to economics, and no new coal facilities were in the works, so "we were heading to retiring coal by the end of the decade anyway," said climate analyst Alden Meyer of the European think-tank E3G. That's because natural gas and renewable energy are cheaper, so it was market forces, he said.

An anonymous reader writes: Using realistic ecological modeling, scientists led by Western Sydney University's Jürgen Knauer found that the globe's vegetation could actually be taking on about 20% more of the CO2 humans have pumped into the atmosphere and will continue to do so through to the end of the century.

"What we found is that a well-established climate model that is used to feed into global climate assessments by the likes of the IPCC (Intergovernmental Panel on Climate Change) predicts stronger and sustained carbon uptake until the end of the 21st century when extended to account for the impact of some critical physiological processes that govern how plants conduct photosynthesis," said Knauer.

Mathematical models of ecological systems are used to understand complex ecological processes and in turn attempt to predict how the real ecosystems they're based on will change. The researchers found that the more complex their modeling, the more surprising the results – in the environment's favor.

Current models, the team adds, are not that complex so likely underestimate future CO2 uptake by vegetation... [T]he modeling makes a strong case for the value of greening projects and their importance in comprehensive approaches to tackling global warming.

It can regenerate bits of its body. Ancient Mexicans revered it as a mischievous, shape-shifting god.

They named it axolotl — translation: "water monster" — and it's a "salamander with a Mona Lisa smile," reports the Washington Post, "an alien-looking creature with a permanent grin and a crown of feathery gills". But while there's over a million in the world's scientific laboratories, back in its only natural habitat — the canals of Lake Xochimilco in Mexico City — it's on the brink of extinction. In hopes of preventing the annihilation of a species with mystifying traits, ecologists at Mexico's National Autonomous University are giving the public the chance to virtually adopt an axolotl. For $30, $180 or $360, donors can choose the sex, age and name of the little buddy they get to call theirs for a month, six months or a year, respectively. The axolotls stay in Mexico, but donors receive an adoption kit with an infographic, the axolotl's identification card, a certificate of adoption and a personalized thank-you letter.

The campaign also includes options to buy an axolotl a meal for $10 or to fix up one of their homes for $50. And for those wanting to splurge a bit more, participants can adopt the axolotl's refuge of chinampas — the artificial islands that dot Lake Xochimilco — for one, six or 12 months starting at $450. The funds will go toward building refuges for the axolotl and restoring its habitat, which has been devastated by the effects of Mexico City's urbanization over the last decades, said Luis Zambrano, an ecologist at Mexico's National Autonomous University.

"A species can't be a species without its habitat," Zambrano said.
Axolotls have "helped scientists understand how organs develop in vertebrates, uncover the causes of the birth defect spina bifida and discover thyroid hormones..."

"The salamanders have also become beloved exotic pets — to the point that 'there's claw machines in Japan that let you pick up an axolotl to take home,' Zambrano added."

Tuesday the New York Times reported that while hosting the global climate summit, the United Arab Emirates also hoped to lobby for oil and gas deals around the world.

But Friday the United Arab Emirates announced that they'd also started a $30 billion climate fund, reports Reuters, and that fund "aims to attract $250 billion of investment by the end of the decade."

The New York Times notes the fund started just months ago, and "at least 20 percent of the funds, would be earmarked for projects in the developing world, where it is especially difficult to finance clean energy projects because interest rates are high and lenders shy away from what they perceive as risky investments."

The Washington Post notes that "It immediately becomes one of the world's largest climate-focused investment funds." "This is a big deal," said Mona Dajani, global head of renewables, energy and infrastructure at the law firm Shearman and Sterling. "We have seen other programs previously, but not at this level. They were too scattered, too small, not aligned to the broader financial sector."

The lack of cash feeds into other challenges that can make it impossible to scale up clean energy in some countries. Without a steady pipeline of projects, there are no established supply chains, and nations find themselves locked out of markets for key components that are in high demand elsewhere, such as solar cells and critical minerals used to make giant batteries that store renewable power. The Global South will need an immense amount of such battery storage by the end of the decade, according to the Rockefeller Foundation, enough to store about as much power as is produced by 90 large nuclear plants. The storage is used to bottle wind and solar power and distribute it back into grids after dark and when the wind dies down.
The Post also reports that "the money to fund the projects will come largely from oil revenue." While the UAE framed its initiative as a call to global action, it is at least partly geared toward generating returns. It is one of several forays the UAE is making into clean-energy finance as it seeks to diversify its economy amid predictions the demand for oil will slump in coming years... The new initiative puts a spotlight on the UAE's evolving role in the fight against climate change. The country is at once one of the world's biggest contributors to warming, pumping massive amounts of oil into the global economy, while also using its fossil fuel wealth to put itself on the vanguard of energy innovation.

An anonymous reader quotes a report from Motherboard: On Wednesday, a group of military and military-adjacent scientists gathered at a conference to discuss the possibility of creating a super soldier. They discussed breeding programs, Marvel movies, The Matrix, and the various technologies the Pentagon is researching with the goal of creating a real life super soldier complete with cybernetic implants and thorny ethical issues surrounding bodily autonomy. The talk happened at the The Interservice/Industry Training, Simulation and Education Conference, or I/ITSEC, an annual conference where military leaders come to talk shop and simulation corporations gather to demo new products. It's the kind of place where execs and generals don virtual reality helmets and talk about the virtues of VR sims. You could even catch members of congress talking about the importance of simulations and war. "Winning the war of cognition by pushing readiness and lethality boundaries," reads the official poster for the 2019 I/ITSEC.

It was here, in Orlando, Florida, where five illustrious members of the military-industrial complex gathered to discuss super soldiers at the "Black Swan -- Dawn of the Super Soldier" panel. Lauren Reinerman-Jones, an analyst from Defense Acquisition University, moderated a panel that included U.S. Army Developmental Command representatives George Matook and Irwin Hudson, research scientist J.J. Walcutt, and Richard McKinley, who works on "non-invasive brain stimulation" for the Air Force. I/TSEC advertised the panel in its program with a picture of the experts next to a posing Master Chief, the genetically enhanced super soldier from the Halo video game franchise. Throughout the conversation, which covered the nuts and bolts of what's possible now and what's about to be possible along with various ethical concerns, references to science fiction and fantasy stories were common. Some of the ideas discussed include synthetic blood, pain-numbing stimulants, limb regeneration, and non-invasive brain stimulation. The discussion references the John Scalzi book about a near future where Earth wages war by offering the elderly new youthful bodies in exchange for military service.

They also discuss the ethical and legal concerns surrounding the creation of super soldiers, as well as the societal norms and potential risks. "What risks are we willing to take? There's all these wonderful things we can do," Matook said. "We don't want a fair fight. We really don't, this is not an honorable thing. We want our guys to be over-matching any possible enemies, right? So why aren't we giving them pharmaceutical enhancements? Why are we making them run all week when we could just be giving them steroids? There's all these other things you could do if you change societal norms and ethics. And laws, in some cases."

The discussion concludes with considerations about the long-term effects, reversibility of enhancements, and the potential ownership of enhanced individuals by the government. "So if you do these kinds of changes to an individual, what do you do when their service is up? What happens? Or are they just literally owned by the government for life," asks Reinerman-Jones. Hudson replied with a grim joke: "Termination."

The Space Weather Prediction Center is closely watching the arrival of a super-hot plasma eruption, known as a coronal mass ejection (CME), that will slam into Earth tonight, writes longtime Slashdot reader StyleChief. Images of the huge sunspot "rotating to face the earth" can be viewed here. The Space Weather Prediction Center reports: With 3 CMEs already inbound, the addition of a 4th, full halo CME has prompted SWPC forecasters to upgrade the G2 Watch on 01 Dec to a G3 Watch. This faster-moving halo CME is progged to merge with 2 of the 3 upstream CMEs, all arriving at Earth on 01 Dec. G3 (Strong) conditions are now likely on 01 Dec. Continue to monitor spaceweather.gov for the latest updates. "The rapid Earth-bound CME left the sun on Nov. 29 during a powerful M9.8-class solar flare eruption," reports Space.com. "But it isn't alone."

"The speedy plasma outburst will merge with several slower upstream CMEs that left the sun a day earlier (Nov. 28), creating a 'Cannibal CME' that will likely trigger a strong geomagnetic storm akin to a Nov. 5 event that supercharged auroras and STEVE around the world."

Astronomers have discovered six planets orbiting a bright star in perfect resonance. The star system, 100 light-years from Earth, was described on Wednesday in a paper published in the journal Nature. From a report: The discovery of the system could give astronomers a unique opportunity to trace the evolution of these worlds to when they first formed, and potentially offer insights into how our solar system got to be the way it is today. "It's like looking at a fossil," said Rafael Luque, an astronomer at the University of Chicago who led the study. "The orbits of the planets today are the same as they were a billion years ago."

Researchers think that when planets first form, their orbits around a star are in sync. That is, the time it takes for one planet to waltz around its host star might be the same amount of time it takes for a second planet to circle exactly twice, or exactly three times. Systems that line up like this are known as orbital resonances. But, despite the theory, finding resonances in the Milky Way is rare. Only 1 percent of planetary systems still preserve this symmetry.

Most of the time, planetary orbits get knocked out of sync by an event that upsets the gravitational balance of the system. That could be a close encounter with another star, the formation of a massive planet like Jupiter, or a giant impact from space on one planet that causes a ripple effect in other orbits. When this happens, Dr. Luque said, planetary orbits become too chaotic to mathematically describe, and knowledge of their evolution is indecipherable. Astronomers are lucky to find even one pair of exoplanets in resonance. But in the newly discovered star system, there are a whopping five pairs, because all six planets have orbits that are in sync with one another. Dr. Luque described it as "the 1 percent of the 1 percent."

An "unprecedented outcome" that would keep alive hopes of limiting global temperature rises to 1.5C is within reach, the president-designate of the UN Cop28 climate summit has said -- and even Saudi Arabia is expected to come with positive commitments. From a report: Significant progress has been made in recent weeks on key aspects of a deal at the crucial meeting that starts in Dubai this week, with countries agreeing a blueprint for a fund for the most vulnerable, and reaching an important milestone on climate finance. Sultan Al Jaber, who will lead the talks on behalf of the Cop28 host country, the United Arab Emirates, told the Guardian in an exclusive interview on the eve of the talks that the positive momentum meant the world could agree a "robust roadmap" of cuts in greenhouse gas emissions by 2030 that would meet scientific advice.

"I have to be cautiously optimistic," he said. "But I have the levers and the traction that I am experiencing today that will allow for us to deliver the unprecedented outcome that we all hope for." He added: "Getting back on track, and ensuring that the world accepts a robust understanding of a roadmap to 2030 that will keep [a temperature rise above pre-industrial levels of] 1.5C (2.7F) within reach is my only goal."

An anonymous reader quotes a report from the New York Times: As the host of global climate talks that begin this week, the United Arab Emirates is expected to play a central role in forging an agreement to move the world more rapidly away from coal, oil and gas. But behind the scenes, the Emirates has sought to use its position as host to pursue a contradictory goal: to lobby on oil and gas deals around the world, according to an internal document made public by a whistle-blower. In one example, the document offers guidance for Emirati climate officials to use meetings with Brazil's environment minister to enlist her help with a local petrochemical deal by the Abu Dhabi National Oil Company, the Emirates' state-run oil and gas company, known as Adnoc. Emirati officials should also inform their Chinese counterparts that Adnoc was "willing to jointly evaluate international LNG opportunities" in Mozambique, Canada and Australia, the document indicates. LNG stands for liquefied natural gas, which is a fossil fuel and a driver of global warming.

These and other details in the nearly 50-page document -- obtained by the Centre for Climate Reportingand the BBC -- have cast a pall over the climate summit, which begins on Thursday. They are indications, experts said, that the U.A.E. is blurring the boundary between its powerful standing as host of the United Nations climate conference, and U.A.E.'s position as one of the world's largest oil and gas exporters. [...] In private, delegates preparing to travel to Dubai expressed concerns that the cloud surrounding the host nation threatened to discredit the talks themselves. The allegations, they said, risked undermining what many have hoped the negotiations will yield: a deal to replace polluting fossil fuels with clean energy such as wind and solar power. But many said they were reluctant to speak out publicly, for fear of jeopardizing their ability to negotiate.

American Airlines today announced a deal with Graphyte to purchase "carbon removal credits" to help accelerate its long-term goal to reach net-zero emissions by 2050. According to the announcement, the airline will purchase credits equivalent to 10,000 tons of permanent carbon removal with delivery scheduled for early 2025. From the report: Graphyte uses a process called carbon casting that converts byproducts from the agriculture and timber industries such as wood bark, rice hulls and plant stalks which have captured carbon dioxide through photosynthesis. The plant material is dried to prevent decomposition and then converted into carbon dense bricks that are sealed with a polymer barrier. These bricks are stored in underground chambers and monitored with sensors to make sure the carbon does not escape, according to the company.

Plant byproducts from the agriculture and timber industries are typically burned or left to decompose, which returns carbon dioxide into the atmosphere. This biomass material is equivalent to 3 billion tons of potential carbon dioxide removal annually, according to Graphyte. Graphyte says carbon casting is a cheap, scalable alternative to expensive and technologically intensive methods of carbon capture and removal. The company is backed by Breakthrough Energy Ventures, an investment firm founded by Bill Gates that funds clean energy technologies.

Germany will entice electric vehicle drivers to charge up when there's plenty of green power on the system by offering them cheap tariffs linked to wholesale prices. From a report: It's part of a push by the government to better integrate huge swings of renewable power onto the grid when it's particularly sunny or windy by ramping demand up or down to match. It's an example of the flexible tariffs that are popping up all over Europe aimed at consumers with electricity-hungry devices like heat pumps or cars that can help balance the network.

Europe's largest economy aims to produce 80% of its power from renewables by 2030, but is struggling to expand its network infrastructure. To reduce bottlenecks, consumers' network costs should be reduced by as much as $208 per year, or they can opt for a 60% reduction on their energy price and benefit from other levy exemptions for heat pumps, the regulator Bundesnetzagentur said in a statement Monday.

"On a typical day 1,300 planes take off and land at Heathrow Airport, and keeping that going requires around 20 million litres of jet fuel every day," reports the BBC. "That's the equivalent of filling up your car around 400,000 times.

"But, when it comes to fuel, airports around the world are having to have a major rethink..." To be of any use to the aviation industry, hydrogen needs to be in its liquid form, which involves chilling it to minus 253C. Handling a liquid at that kind of temperature is immensely challenging. Given the chance, liquid hydrogen will "boil-off" and escape as a gas — potentially becoming a hazard. So tanks, pipes and hoses all have to be extra-insulated to keep the liquid cold.

France's Air Liquide has a lot of experience in this area. For around 50 years it has been supplying cryogenic hydrogen to the Ariane rockets of the European Space Agency (ESA)... Over the past three years, in partnership with Airbus and France's biggest airport operator, Group ADP, Air Liquide has been investigating the potential of hydrogen in the aviation business. It is also part of the H2Fly consortium which this summer successfully flew an aircraft using liquid hydrogen. For Air Liquide, it was an opportunity to test systems for fuelling a hydrogen aircraft...

However, installing the equipment needed to store and distribute hydrogen at airports will not be cheap. The consultancy Bain & Company estimates it could cost as much as a billion dollars per airport. One start-up, Universal Hydrogen, says it has a solution... The company has developed special tanks to hold liquid hydrogen (UH calls them modules), which can then be trucked to the airport. The modules are designed to slot straight into the aircraft, where they can be plugged into the propulsion system. No need for pipes, hoses and pumps.

The modules are extremely well insulated and can keep the hydrogen in its liquid form for four days. Two modules would hold 360kg of hydrogen and would be able to fly an aircraft 500 miles, plus an extra 45 minutes of flight time in reserve.

An anonymous reader shared this report from the Washington Post: In 2024, a new spacecraft will hurtle toward Jupiter in a bid to learn whether its moon Europa is capable of supporting life. The craft will carry more than high-tech sensors: It also will bear a poem and hundreds of thousands of human names.

Yours could be one of them.

NASA is asking people to submit their names ahead of the mission's October 2024 launch. Those submitted by the end of 2023 will go into space on the Europa Clipper spacecraft, which should enter Jupiter's orbit in 2030... They'll eventually be stenciled onto a dime-sized microchip in microscopic writing, then attached to a metal plate engraved with the poem that will accompany the craft.
700,000 names have been submitted so far — and they'll all be carried a distance of over 1.8 billion miles.

They'll travel through space with a poem that ends by describing what we humans on earth are made of — including "a need to call out through the dark."

Brazil has signed onto an agreement to triple renewable energy globally by 2030 and shift away from using coal, the country's Foreign Ministry said on Friday, joining a prospective deal backed by the European Union, U.S. and United Arab Emirates. From a report: South America's largest country is now one of roughly 100 countries that have signed onto the deal, according to a European official familiar with the matter. Sources told Reuters earlier this month the aim is for the deal to be officially adopted by leaders attending the United Nation's COP28 climate negotiations that begins next week in Dubai.

Brazil's embassy in Abu Dhabi said in a letter to the United Arab Emirates' Foreign Ministry that it would join the deal titled the "Global Renewables and Energy Efficiency Targets Pledge." A spokesperson for Brazil's Foreign Ministry confirmed the country has decided to join the pact. Brazil is already a major player in renewable energy. More than 80% of the country's electricity comes from renewable sources, led by hydropower with solar and wind energy expanding rapidly.

The world's biggest iceberg is on the move after more than 30 years being stuck to the ocean floor. From a report: The iceberg, called A23a, split from the Antarctic coastline in 1986. But it swiftly grounded in the Weddell Sea, becoming, essentially, an ice island. At almost 4,000 sq km (1,500 sq miles) in area, it's more than twice the size of Greater London. The past year has seen it drifting at speed, and the berg is now about to spill beyond Antarctic waters. A23a is a true colossus, and it's not just its width that impresses.

This slab of ice is some 400m (1,312 ft) thick. For comparison, the London Shard, the tallest skyscraper in Europe, is a mere 310m tall. At the time, it was hosting a Soviet research station, which just illustrates how long ago its calving occurred. Moscow despatched an expedition to remove equipment from the Druzhnaya 1 base, fearing it would be lost. But the tabular berg didn't move far from the coast before its deep keel anchored it rigidly to the Weddell's bottom-muds.

So, why, after almost 40 years, is A23a on the move now? "I asked a couple of colleagues about this, wondering if there was any possible change in shelf water temperatures that might have provoked it, but the consensus is the time had just come," said Dr Andrew Fleming, a remote sensing expert from the British Antarctic Survey. "It was grounded since 1986 but eventually it was going to decrease (in size) sufficiently to lose grip and start moving. I spotted first movement back in 2020." A23a has put on a spurt in recent months, driven by winds and currents, and is now passing the northern tip of the Antarctic Peninsula.

Dirty air killed more than half a million people in the EU in 2021, estimates show, and about half of the deaths could have been avoided by cutting pollution to the limits recommended by doctors. From a report: The researchers from the European Environment Agency attributed 253,000 early deaths to concentrations of fine particulates known as PM2.5 that breached the World Health Organization's maximum guideline limits of 5ug/m3. A further 52,000 deaths came from excessive levels of nitrogen dioxide and 22,000 deaths from short-term exposure to excessive levels of ozone.

"The figures released today by the EEA remind us that air pollution is still the number one environmental health problem in the EU," said Virginijus Sinkevicius, the EU's environment commissioner. Doctors say air pollution is one of the biggest killers in the world but death tolls will drop quickly if countries clean up their economies. Between 2005 and 2021, the number of deaths from PM2.5 in the EU fell 41%, and the EU aims to reach 55% by the end of the decade. The WHO, which tightened its air quality guidelines in 2021, warns that no level of air pollution can be considered safe but has set upper limits for certain pollutants. The European parliament voted in September to align the EU's air quality rules with the WHO's but decided to delay doing so until 2035.

Coal, the dirtiest of fossil fuels, is far more harmful to human health than previously thought, according to a new report, which found that coal emissions are associated with double the mortality risk compared with fine airborne particles from other sources. From a report: The research, published Thursday in the journal Science, linked coal pollution to 460,000 deaths among Medicare recipients aged 65 and older between 1999 and 2020. Yet the study also found that during that period the shuttering of coal plants in the United State, coupled with the installation of scrubbers in the smokestacks to "clean" coal exhaust, has had salubrious effects. Deaths attributable to coal plant emissions among Medicare recipients dropped from about 50,000 a year in 1999 to 1,600 in 2020, a decrease of more than 95 percent, the researchers found.

"Things were bad, it was terrible," Lucas Henneman, the study's lead author, and an assistant professor in environmental engineering at George Mason University, said in an interview. "We made progress, and that's really good." Researchers from six universities collected emissions data from 480 coal power plants between 1999 and 2020. They used atmospheric modeling to track how sulfur dioxide converted into particulate matter and where it was carried by wind, and then examined millions of Medicare patient deaths by ZIP code.

Though the researchers could not identify exact causes of death, the statistical model showed that areas with more airborne coal particulates had higher death rates. Some 138 coal plants each contributed to at least 1,000 excess deaths, and 10 plants were linked to more than 5,000 deaths apiece, the researchers found. While fine particulate matter, known as P.M. 2.5, is frequently examined for its health risks, the researchers found that inhaling those fine particles from coal exhaust was especially deadly.