Science
Earth’s 10 Hottest Years on Record Are the Last 10

With the addition of 2024, yet another record-hot year, the past 10 years have been the 10 hottest in nearly 200 years of record-keeping, the World Meteorological Organization reports.
“That’s never happened before,” said Chris Hewitt, the director of the W.M.O.’s climate services division. It marks the first time since record keeping began that all of the 10 hottest years have fallen within the most recent decade.
2024 was the single warmest year on record, surpassing even 2023’s wide lead over other recent years. The planet’s surface was approximately 1.55 degrees Celsius warmer than its average during a reference period that approximates the preindustrial era, from 1850-1900.
The annual report from the W.M.O., a United Nations agency, includes input from dozens of experts and institutions from around the world and sheds further light on the record-breaking heat of 2024 and places it in the context of Earth’s long-term warming from climate change.
The extra energy in the atmosphere and the oceans helped fuel climate-related disasters around the globe. Extreme weather events like drought, storms and wildfires displaced hundreds of thousands of people from their homes, the report says.
Atmospheric levels of greenhouse gases released from fossil fuel combustion continue to rise. In 2024, the concentration of carbon dioxide hit amounts unseen in at least two million years, according to the report.
Concentrations of two other important greenhouse gases, methane and nitrous oxide, reached levels unseen in at least 800,000 years. Homo sapiens, or modern humans, emerged around 300,000 years ago, so our species has never before experienced an atmosphere so laden with planet-warming greenhouse gases.
When countries signed the Paris Agreement in 2015, they agreed to try to limit global warming to 1.5 degrees Celsius above preindustrial levels.
“While a single year above 1.5 degrees C of warming does not indicate that the long-term temperature goals of the Paris Agreement are out of reach, it is a wake-up call that we are increasing the risks to our lives, economies and to the planet,” Celeste Saulo, the secretary general of the W.M.O., said in a statement.
The new report estimates that long-term warming has reached 1.25 to 1.41 degrees Celsius above preindustrial levels, although the margins of error for some estimates extend beyond 1.5 degrees. The report authors estimate that last year, El Niño and other factors contributed an additional 0.1 or 0.2 of a degree of temporary warming.
El Niño is a natural climate pattern that tends to slightly raise the overall surface temperature of the planet. Record warmth, however, continued into 2025, even through El Niño’s transition into the opposing pattern, La Niña.
“It’s been really quite extraordinary to see that warmth continue for so long,” John Kennedy, the scientific coordinator and lead author of the report, said during a call with reporters.
This warmth is especially apparent in the oceans, where key indicators of climate change are now accelerating.
The oceans have so far absorbed around 90 percent of the additional heat trapped inside Earth’s atmosphere by greenhouse gases. The oceans’ heat content — a way to measure this warmth throughout different depths — also reached a record high last year. Over the past two decades, from 2005 to 2024, the oceans warmed more than twice as fast as they did from 1960 to 2005, according to the report.
Increased ocean temperatures have had devastating consequences for marine life. By April 2024, warm-water corals had been bleached in every ocean basin where they grow.
Global average sea-level rise also reached a record high in 2024, according to the report. The speed at which the seas are rising has also more than doubled in recent years: 4.7 millimeters per year in the past decade, from 2015 to 2024, compared with 2.1 millimeters per year from 1993 to 2002.
The World Meteorological Organization’s work depends on international cooperation among its 101 member countries, including the United States.
“If you look at how weather has progressed since the initiation of the W.M.O. in 1950, you can now see that you can have the forecast on your smartphone,” said Omar Baddour, the W.M.O.’s chief of climate monitoring. “You cannot believe how much collaboration is behind this.”
Data from NASA and the National Oceanic and Atmospheric Administration, which recently lost hundreds of staff positions as part of the rapid, large-scale cuts to the federal bureaucracy the Trump administration undertook beginning earlier this year, are included in the W.M.O.’s new report.

Science
Facing self-imposed budget cuts, Republicans in Congress mull the future of Medicaid
Congress is forging ahead with its budget for next year, but the most controversial program on the chopping block — Medicaid — is causing a rift within the Republican Party.
Earlier this year, Congress passed a budget blueprint that contains billions of dollars in cuts to federal spending, which House Speaker Mike Johnson (R-La.) promised did not touch Medicaid. But as lawmakers hammer out the details of the spending plan, changes to the popular government-funded healthcare program are looming.
Republicans are scrambling to find creative ways to fulfill budget cuts they voted on without gutting Medicaid, a politically risky move that would endanger healthcare for more than 71 million people nationwide and lead to cascading effects for hospitals and nursing homes.
So far, the options being floated — ramping up eligibility and work requirements and limiting access for immigrants — would have a drastic effect on Medicaid, even as Republicans brand their vision as tackling “waste, fraud and abuse,” a popular line used by Trump administration officials who are downsizing federal government departments and programs.
The GOP is “strengthening Medicaid for people who need it by eliminating things like fraud, waste and abuse, which is a huge problem in the program, including removing illegal aliens,” Johnson said at a news conference Tuesday.
Other options that lawmakers have considered involve drastically cutting how much money the federal government gives to states that expanded Medicaid coverage under the Affordable Care Act. If the minimum threshold were eliminated, California could lose as much as $156.5 billion in federal funding for the program over the next 10 years, according to an analysis by the Robert Wood Johnson Foundation.
“States can’t really raise that kind of revenue in general,” said Kathy Hempstead, senior policy officer at the foundation. “What states will do is maybe raise some revenue, but they’d have to start cutting services.”
Johnson indicated Tuesday that he’d moved away from that consideration.
Still, advocates warn that other options clamping down on eligibility will inadvertently disadvantage millions of people who qualify for the program.
The budget Congress passed included an order for the House Energy and Commerce Committee, which governs spending on Medicaid, to slash $880 billion over 10 years. The nonpartisan Congressional Budget Office has said that level of reduction is possible only by cutting into Medicaid.
In a letter to committee leaders Wednesday, the CBO outlined how federal changes to Medicaid would result in a shrinking of the program.
It anticipates that states would spend more themselves on Medicaid, reduce payment rates to healthcare providers, limit optional benefits and reduce enrollment.
Last week, the committee postponed a planned meeting on the bill over continued disagreements among its members. Matt Herdman, state director for Protect Our Care California, saw the delay as a partial win.
“They’ve clearly noticed they have a huge problem on their hands. They have a ton of vulnerable members,” Herdman said. “They would not have pushed this back if they thought this was a done deal.”
But Johnson dismissed the idea that the postponement was “a snag,” saying that after meeting with President Trump over the weekend and reviewing numbers, they decided “it just made sense for us to press pause for a week … to get it right.” The speaker said he is still aiming to pass the budget by Memorial Day.
In the meantime, Johnson is wrangling members from the far-right flank of the party, who support defunding and reforming Medicaid, and other Republicans, who are beseeching party leaders to avoid forcing them to vote for the cuts.
Twelve members who represent districts with high Medicaid populations — including California Reps. David Valadao (R-Hanford) and Young Kim (R-Anaheim Hills) — sent a letter to House leaders last month, warning that a vote to cut Medicaid would jeopardize their hard-won districts in future elections.
“We cannot and will not support a final reconciliation bill that includes any reduction in Medicaid coverage for vulnerable populations,” the letter read, adding that the lawmakers support reforming the program. It concluded: “Communities like ours won us the majority, and we have a responsibility to deliver on the promises we made.”
Valadao told Politico that he texts and meets with his colleagues in Congress regularly, working on alternative solutions. Valadao has serious motivation to save the program — he represents the California district with the highest percentage of Medicaid recipients, and he lost his congressional seat after voting to repeal the Affordable Care Act in 2017.
His office declined an interview for this article.
Protests to preserve Medicaid have been sweeping the nation for weeks. The Service Employees International Union, home to many care workers in the U.S., organized several demonstrations outside Republican congressional offices in recent weeks, including Kim’s.
“I’m seeing unbelievable energy about this,” Herdman said. “I don’t think I’ve seen anything quite as large in person since the pandemic on a legislative issue.”
Rep. Debbie Dingell (D-Mich.), who sits on the Energy and Commerce Committee, told reporters Tuesday that she’s been hearing from constituents in her district who rely on Medicaid to sustain their healthcare.
“Medicaid is a lifeline. It keeps children healthy, it helps parents work and it cares for seniors in nursing homes,” Dingell said. “The American people cannot afford Medicaid cuts, especially as the economy is being crashed around them by President Trump.”
Science
In Their Final Moments, a Pompeii Family Fought to Survive

One day in the year 79, Pompeii came under fire. The explosion of nearby Mount Vesuvius sent a mushroom cloud of ash and rock into the atmosphere, pummeling the ancient Roman trading hub and resort in a ceaseless hail of tiny volcanic rocks.
Many residents ran for their lives, trying to find safety with their loved ones before searing volcanic debris buried the estimated 1,500 residents who remained in Pompeii.
In a study published last month in the journal Scavi di Pompei, scientists documented events at one home in the doomed city where a family sought refuge inside a back room by pushing a wooden bed against a door in a vain attempt to stop a flood of volcanic rocks from the sky, known as lapilli.
The small-but-well-appointed residence is known as the House of Helle and Phrixus, after a richly decorated fresco in the dining room. It depicts the mythological siblings Phrixus and Helle escaping their wicked stepmother on a winged ram only to have Helle fall and, ominously, drown in the sea below.
As with many ancient Roman residences, its atrium, an open-roof room centrally located in the home, was used for ventilation and rainwater collection. But on that day, the recess allowed volcanic rock to more rapidly overtake the space. Most Pompeians “had no clue what was happening,” said Gabriel Zuchtriegel, an author of the study and the director of the Archaeological Park of Pompeii. “Many thought the end of the world had come,” he added.
In the years that followed, the hot ash that eventually buried the home solidified and left an imprint that archaeologists filled with plaster to reconstruct the shape of the wooden bed that remained. The technique helps illustrate the horror of the Pompeian dead in their final moments and how perishable everyday items made of wood, textiles and leather were situated in their environments.
The skeletal remains of four people, most likely members of the same family, were identified in the study. The lapilli, which reached heights as high as nine feet in some locations, could not be controlled, and researchers believe the people made a final attempt to escape, leaving the small room in which they had barricaded themselves. They got only as far as the triclinium, the formal dining room where their remains were found.
“The family in the House of Helle and Phrixus probably died when the so-called pyroclastic flow, an avalanche of hot ash and toxic gas, arrived and parts of the building collapsed,” Dr. Zuchtriegel said.
He and his colleagues suggest that the remains of the four people found in the home were from a family that stayed behind and may have included some enslaved members who worked at the residence. Still, archaeologists don’t know for sure if they lived there or simply took refuge after the homeowners had already escaped.
“It’s not certain that the individuals found in the house as victims were part of the family,” said Marcello Mogetta, an associate professor of Roman art and archaeology at the University of Missouri who was not involved in the study.
Among the skeletal remains was a bronze bulla that belonged to a child. The ancient amulets were worn like lockets around the necks of young free boys to shield them from danger until they reached adulthood.
“The amulet was supposed to protect them, so there’s a cruel irony to the fact that it didn’t,” said Caitie Barrett, a professor of archaeology at Cornell University who was not involved in the study.
Bourbon explorers sent by Charles III in the 18th century carried out rudimentary excavations of Pompeii that disturbed the skeletal remains of the victims found in the House of Helle and Phrixus. When they tunneled into the residence in search of valuables like jewelry and artwork, they left behind holes in the walls. These early excavators often had little interest in human remains, either in respecting their preservation, dignifying their deaths or studying their material culture.
But today it’s the human toll that feels most prominent for archaeologists and for many of the visitors who regularly pour into Pompeii. Whether or not the remains belonged to those who were indeed family will be something that researchers may try to uncover through DNA analysis in the near future.
Family or not, it doesn’t change the human tragedy of the story.
“Whatever the nature of their specific relations, they would have been the last people to offer each other comfort at the end,” Dr. Barrett said.
Science
Antelope Valley residents say they are fed up with rampant dumping, official inaction

Eric Eller likes to ride his dirt bikes through the canyons, dry riverbeds and rocky outcroppings of the Antelope Valley in the high desert north of Los Angeles.
Eller’s an off-the-grid kind of guy with a “Mad Max” vibe — living in a house on a remote plot of land next to a jury-rigged trailer where he tinkers with the remnants and pieces of gutted automobiles, motorcycles and other mechanical debris.
But Eller’s isolation was obliterated last June when dozens of big dump trucks began snaking up the dirt road behind his house and discarding their loads into the nearby dry river canyon. The caravan of waste-haulers continued in the days that followed, often arriving after sundown or in the dark hours before dawn.
Two months later, the convoys abruptly stopped. But not before the makeshift dump’s surface had been camouflaged with dirt and mulch — much of which has since blown away, revealing a 30-foot-deep noxious stew of chopped-up concrete, plastic tampon applicators, faded plastic children’s toys, toothbrushes, syringes, empty caulking tubes, two-by-fours, faded books, weathered Styrofoam pipe insulation, plastic bucket tops and more.
EL MIRAGE, CA – APRIL 18: A truck leaves the Circle Green mulch dump site near El Mirage on Friday, April 18, 2025. (Myung J. Chun / Los Angeles Times)
Across the Antelope Valley, waste trucks are hauling garbage in from the Greater Los Angeles area and Central Valley towns such as Bakersfield, and then dumping it at makeshift sites. Letters, bills and envelopes visible at several of these waste sites in April showed addresses in Pacoima, Los Angeles and Van Nuys, among other cities.
“Illegal dumping has been a problem in the Antelope Valley for decades,” said Chuck Bostwick, a senior field deputy for Los Angeles County Supervisor Kathryn Barger, who represents much of the area. “But it’s gotten worse in the last two or three years, markedly worse.”
In some cases, such as the site behind Eller’s home, the waste sites are flat-out unauthorized. No landowner has given permission to dump at the site, and the waste consists of construction, household and medical debris.
But in others cases, the waste-haulers have the landowners’ permission to dump — but are disposing waste that should be going to landfills equipped to handle household and industrial waste, lawsuits claim.
In one lawsuit filed in U.S. District Court in Los Angeles, residents claim that major residential waste-hauling companies including Athens Services, California Waste Services and Universal Waste Systems are dumping hazardous substances without authorization.
The suit claims these companies are disguising the construction and demolition debris as “green waste by unlawfully covering this waste with highly flammable wood chips and other organic waste.”
Eric Casper, the president of California Waste Services, said in an email that his company has “never engaged in dumping waste of any kind, at any time, in the Antelope Valley — legal or illegal. Nor anywhere else.”

A sneaker among the trash dumped at Adobe Mountain near Lancaster, CA. Locals say this was a canyon before it was filled in to hold trash. Photographed on Friday, April 18, 2025.
Athens Services also denied any illegal dumping, saying in a statement that California’s organics recycling law “encourages sending compostable material to third parties such as farmers and other property owners for beneficial use. This is the material that Athens Services produces and distributes.”
Universal Waste Systems and other companies named in the suit didn’t respond to requests for comment, nor have they filed responses to the federal suit.
Residents say there are more than 100 dump sites scattered throughout the valley — from Lake Los Angeles to the Antelope Valley California Poppy Reserve and north to Mojave — that they contend are unauthorized.
Some of these sites cover hundreds of acres and extend dozens of feet deep. And residents worry that what they can see — from the roads or their homes — is just the tip of a malodorous and malignant iceberg, and that there are probably dozens more they haven’t yet identified.
They complain they are plagued by the toxic, sour and rotten-egg like smells emanating from the discarded trash that cooks in the hot sun and then wafts across their properties.
They also note that the flammable mulch and other materials in the dump, combined with a broiling desert sun, makes for an acute fire risk.
Between 2020 and 2024, the Los Angeles County Fire Department responded to 42 mulch or trash-related fires in the Antelope Valley, ranging from a quarter-acre to 22 acres, ultimately costing taxpayers roughly $1.6 million to extinguish, according to Los Angeles County documents.
Ashley Mroz, who lives in the Antelope Valley community of Neenach, said a mulch-covered dump site spontaneously combusted near her home last summer.
“It had been smoldering for days and days,” said Mroz, one of the plaintiffs in the federal court suit. “We could not even go outside. The smell was so horrific.”

Trash dumped at Adobe Mountain near Lancaster, CA. Locals say this was a canyon before it was filled in to hold trash. Photographed on Friday, April 18, 2025.
And the scourge has spread beyond the dump sites: Shredded plastic debris can be seen hanging from roadside Joshua trees and creosote bushes. While a midday view across the arid landscape reveals a sea of glimmering, reflective glass shards, like the tips of cresting waves over a vast, brown ocean.
According to Antelope Valley residents and the federal suit, property owners in some cases have given permission — and received payments for — waste to be dumped on their land. Not only do these sites pose a nuisance to the neighbors who live adjacent to or near them, in some cases the material being dumped includes industrial and household waste that can leach into the groundwater.
In its statement, Athens pointed out that property owners sometimes give permission to accept material from multiple waste companies.
“To the extent there are any instances of noncompliant material, we are confident the evidence will demonstrate that it came from another source,” Athens said.
Encounter in Adelanto
On a blustery day in April in the high desert town of Adelanto, local residents watched as two dump trucks offloaded their waste into a San Bernardino county-certified organic waste dump site that is surrounded by eight- to 10-foot high berms of mulch-like waste laced with shredded plastic, insulated wires and chopped-up, plastic children’s toys.
Through a break in the berm, the residents could see that the ground around the recently dumped haul glittered in the sunlight with broken glass, while stalks of what appeared to be insulated wires and rigid plastic stood sentry across the 138-acre expanse.
Two men sitting in a silver GMC pickup truck who were watching the disposal drove over to the gawking residents.
When the residents asked who they were and what the trucks were dumping, the men declined to answer and referred questions to the owner of the property, which The Times later determined to be Kevin Sutton, the owner of a company called Circle Green Inc. Sutton didn’t respond to requests for comment.
As neighbors and a Times reporter and photographer drove away from the site, the silver pickup followed for several miles, tailgating and swerving erratically. The truck turned around only when the small caravan came across a handful of heavily armed California Fish and Game law enforcement agents parked alongside the road.
“It’s the Wild West out here,” said Kristina Brown, a Lancaster property owner who is a party to the federal suit.
A convenient dumping ground
The Antelope Valley’s proximity to Los Angeles and its vast stretches of wild desert make it a prime target for unauthorized dumping.
Sitting at roughly 3,000 feet above sea level, and surrounded by the Tehachapi, Sierra Pelona and San Gabriel mountains, the valley is also divided by jurisdiction — with Los Angeles, Kern and San Bernardino counties all claiming some territory.
“For decades, our illegal dumping was small-time stuff,” said Bostwick, Supervisor Barger’s field deputy. “It was somebody who had a sofa they couldn’t be bothered to take to the dump or they didn’t want to pay, so they dumped it out in the desert. There was commercial dumping then, but it was small time as well.”
But then the state’s waste laws changed, he said.
Starting in 1989, California began requiring municipalities to divert 50% of their waste away from landfill and toward more sustainable waste management solutions, such as recycling and compost. And as Bostwick noted, the vast open spaces of the Antelope Valley beckoned.
In 2022, lawmakers implemented Senate Bill 1383, which initially mandated the diversion of 50% of all food and organic waste away from landfills, but increased to 75% on Jan. 1, 2025. Another 2020 law closed a loophole that had allowed waste companies to dump green waste in landfill, but not have it counted against them. As a result, the need for dumping grounds increased again.
Cities, counties and towns that fail to meet the diversion rates risk fines of up to $10,000 a day.

Mounds of dumped loads at this location south of E. Avenue M in Lake Los Angeles. The mounds contain mulch, trash and construction debris. The site was found by a resident who followed a truck onto the dirt roads. Photographed on Friday, April 18, 2025.
Residents, lawmakers and experts say while the spirit of these laws is noble, in many areas of the state, the infrastructure to handle the diverted waste is lacking — especially in Southern California, where there is not nearly enough farmland or water to handle the increased volumes of green waste leaving the region’s cities and suburbs.
As a result, waste companies and haulers — trying to keep costs down and maintain city contracts — are tempted to dump the waste wherever they can, while local governments are reluctant to crack down on violations, Bostwick said.
State regulations have made “disposal much more expensive and hard to deal with, and so that’s increased the financial incentives for companies or individuals to just dump illegally,” he said.
There’s also very little enforcement.
According to Los Angeles County data, while taxpayers spent roughly $1.3 million between 2017 and 2018 to mitigate illegal waste disposal in the region, that number jumped nearly fourfold in 2022-2023, when taxpayers had to foot $4.46 million to mitigate the problem.
At the same time, the number of cases filed with the Environmental Crimes Division of the district attorney’s office decreased from 15 in 2019 to three in 2023.
In February, CalRecycle, the state’s waste agency, finalized emergency orders they say should empower local law enforcement agencies to stop the illegal disposal. Previous regulations only allowed for action against the owner of land where the disposal was occurring. The new orders allow enforcement officials to target parties that are dumping the materials and the facilities that provided the material.
The orders came after officials from the state agency came to visit the area in October 2024 — prodded by Brown, Mroz and other local residents, many of whom have spent years calling state and local officials about the problem.
Enforcement of these orders, however, is the responsibility of the county, said Lance Klug, a spokesman for the state waste agency.
“Local enforcement agencies can best speak to their enforcement actions to date, and any anticipated next steps, now that emergency regulations are in effect,” he said.
The Los Angeles County Board of Supervisors adopted a measure last year requiring mulch suppliers to take back any contaminated or illegal waste dumped on private land. The measure, which was sponsored by Barger, also directed county agencies to require “stringent record keeping for all land application operations regarding the origin of all incoming loads and testing results from all mulch suppliers.”
County officials couldn’t immediately provide numbers recently when asked how many enforcement actions had been taken.
“There’s literally no enforcement,” said Brown, who worries that the situation is only going to get worse.
Last month, Eller was riding his dirt bike when he stumbled upon a 60-acre expanse of freshly dumped construction debris, medical waste and compost on a plot of land miles away from any major road.
The tire marks from dump trucks hadn’t yet been blown away by the incessant gales of the high desert. No fences or berms were erected to contain the site, making it impossible to see from the road or along the horizon.
He said it feels like they are living in a real-life game of whack-a-mole: As soon as he and his neighbors identify and report one site, the haulers move onto another.
And they say they feel abandoned by regulators, who they say are doing nothing to stop it.
“It feels like we’re screaming into the wind,” Brown said.
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