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
The loss of healthcare subsidies force Californians to pay more or go without
For Mikayla Tencer, being self-employed already meant juggling higher taxes, irregular income and the constant pressure of finding her own health insurance. This year, it also meant rethinking how often she could afford to see a doctor.
The 29-year-old content creator in San Francisco paid $168 a month last year for a Blue Shield health plan through Covered California. This year — without enhanced federal subsidies that expired at the end of December — that same plan would have cost $299 a month, with higher copays.
“People assume that because I’m young, I can just pick the cheapest plan and not worry about it,” Tencer said. “But I do need regular care, especially for mental health.”
Tencer is among tens of thousands of middle-class Californians facing steep increases in health insurance costs after Congress allowed enhanced federal subsidies for Affordable Care Act plans to expire Dec. 31.
Those extra subsidies were enacted in 2021 as part of temporary, pandemic-era relief, boosting financial help for people buying coverage on state-run insurance marketplaces such as Covered California. The law also expanded eligibility to people earning more than 400% of the federal poverty level, about $62,600 for a single person and $128,600 for a family of four.
Mikayla Tencer records a TikTok video featuring eyeliners. Her blog showcases Bay Area attractions and local businesses.
(Paul Kuroda/For The Times)
With the expiration of the enhanced subsidies, people above that income threshold no longer receive federal assistance, and many who still qualify are seeing sharply higher premiums and out-of-pocket costs. On top of the loss of the extra federal benefits, the average Covered California premium this year rose by 10.3% because of fast-rising medical costs.
Jessica Altman, executive director of Covered California, said that about 160,000 Californians lost their subsidies when the enhanced federal assistance expired because their incomes were higher than 400% of the federal poverty level.
To lower her monthly bill, Tencer switched to the cheapest Covered California option, bringing her premium down to about $161 a month. But the savings came with new costs. Primary care and mental health visits now carry $60 copays, up from $35.
When she showed up for a psychiatric appointment to manage her ADHD and generalized anxiety disorder, she said, she learned her doctor was out of network.
“That visit would have been $35 before,” she said. “Now it’s $180 out of pocket.”
Because of the higher costs, Tencer said she has cut therapy from weekly to biweekly sessions.
“The subsidies made it possible for me to be self-employed in the first place,” Tencer said. “Without them, I’m seriously thinking about applying for full-time jobs, even though the market is terrible.”
For another self-employed Californian, the increase was even more dramatic.
Krista, a 42-year-old photographer and videographer in Santa Cruz County, relies on costly monthly intravenous treatments for a rare blood disorder. She asked that her full name not be used but shared her insurance and medical documents with The Times.
Last year, she paid about $285 a month for a Covered California plan. In late December, she received a notice showing her premium would rise to more than $1,200 a month. The rise was due to her loss of federal subsidies, as well as a 23% increase in the premium charged by Blue Shield.
“It terrified me. I thought, how am I ever going to retire?” she asked. “What’s the point?”
Krista ultimately enrolled in a plan costing about $522 a month, still nearly double what she had been paying, with a $5,000 deductible. She said she cannot downgrade to a cheaper plan because her clinic bills her treatment to insurance at roughly $30,000 a month, according to medical statements.
To cut costs and preserve the ability to save for retirement and eventually afford a place of her own, Krista decided to move into an RV on private land. The decision came the same week she received notices showing a rent increase and a steep jump in her health insurance premiums.
Mikayla Tencer, a marketing influencer, with her elder dog, “Lucky” at Alamo Square Park.
(Paul Kuroda/For The Times)
Krista said she had been planning for more than a year to find a long-term living situation that would enable her to live independently, rather than continue paying more for an apartment.
“Nobody asks to be sick,” Krista said. “No one should have their life ruined because they get diagnosed with a disease or break a leg.”
Although overall enrollment in Covered California this year has held steady, Altman said, she worries that more people will drop coverage as bills with the higher premiums arrive in the mail.
Those fears are already playing out.
Jayme Wernicke, a 34-year-old receptionist and single mother in Chico who earns about $49,000 a year, said she was transferred from Medi-Cal to a Covered California Anthem Blue Cross plan at the end of 2023. Her premium rose from about $30 a month to $60, then jumped to roughly $230 after the subsidies expired.
“For them to raise my health insurance almost 400% is just insane to me,” Wernicke said.
Her employer, a small family-owned business, does not offer health insurance. Her plan does not include dental or vision care and, she said, barely covers medical costs.
“At a certain point, it just feels completely counterintuitive,” she said. “Either way, I’m losing.”
Wernicke dropped her own coverage and plans to pay for care with cash, calculating that the state tax penalty is less than the cost of premiums. Her daughter remains insured.
Two other Californian residents told The Times that they also decided to go without coverage because they could no longer afford it. They declined to provide their full names, citing concerns about financial and professional consequences.
Under California law, residents without coverage face an annual penalty of at least $900 per adult and $450 per child.
One, a 29-year-old self-employed publicist in Los Angeles requires medication for epilepsy. Last year, she paid about $535 a month for a silver plan through Covered California. This year, the same plan would have cost $823.
After earning about $55,000 last year, she calculated that paying for care out of pocket would cost far less. Her epilepsy medication costs about $175 every three months without insurance, and her annual doctor visits total roughly $250.
“All of that combined is still far less than paying hundreds of dollars every month,” she said.
Another, April, a 58-year-old small-business owner in San Francisco, canceled her insurance in December after her quoted premium rose to $1,151 a month for a bronze plan and $1,723 for a silver plan, just for herself. Last year, April said she paid $566 for both her and her daughter. This year, her daughter’s premium alone jumped from $155 to $424.
The bronze plan also carried a $3,500 deductible for lab work and specialist visits, meaning she would have had to pay thousands of dollars out of pocket before coverage kicked in, on top of the higher monthly premium.
“The subsidies were absolutely what allowed me to sustain my business,” April said. “They were helping me sustain my financial world and have affordable care.”
She rushed to complete medical tests before dropping coverage and hopes to go a year uninsured.
“The scariest part is not having catastrophic coverage,” she said. “If something happens, it can be millions of dollars.”
Tencer, the content creator in San Francisco, believes that in order to make the nation healthier, affordable healthcare should be universal.
“Our government should be providing it.” she said. “People can’t go to the doctor for routine checkups, they can’t get things checked out early, and they can’t access the resources they need.”
Science
Video: Rare Giant Phantom Jelly Spotted in Deep Waters Near Argentina
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Science
Tuberculosis outbreak reported at Catholic high school in Bay Area. Cases statewide are climbing
Public health officials in Northern California are investigating a tuberculosis outbreak, identifying more than 50 cases at a private Catholic high school and ordering those who are infected to stay home. The outbreak comes as tuberculosis cases have been on the rise statewide since 2023.
The San Francisco Department of Public Health issued a health advisory last week after identifying three active cases and 50 latent cases of tuberculosis at Archbishop Riordan High School in San Francisco. The disease attacks the lungs and remains in the body for years before becoming potentially deadly.
A person with active TB can develop symptoms and is infectious; a person with a latent tuberculosis infection cannot spread the bacteria to others and doesn’t feel sick. However, a person with a latent TB infection is at risk of developing the disease anytime.
The three cases of active TB have been diagnosed at the school since November, according to public health officials. The additional cases of latent TB have been identified in people within the school community.
Archbishop Riordan High School, which recently transitioned from 70 years of exclusively admitting male students to becoming co-ed in 2020, did not immediately respond to the The Times’ request for comment.
School officials told NBC Bay Area news that in-person classes had been canceled and would resume Feb. 9, with hybrid learning in place until Feb. 20. Students who test negative for tuberculosis will be allowed to return to campus even after hybrid learning commences.
Officials with the San Francisco Department of Public Health said the risk to the general population was low. Health officials are currently focused on the high school community.
How serious is a TB diagnosis?
Active TB disease is treatable and curable with appropriate antibiotics if it is identified promptly; some cases require hospitalization. But the percentage of people who have died from the disease is increasing significantly, officials said.
In 2010, 8.4% of Californians with TB died, according to the California Department of Public Health. In 2022, 14% of people in the state with TB died, the highest rate since 1995. Of those who died, 22% died before receiving TB treatment.
The Centers for Disease Control and Prevention estimated that up to 13 million people nationwide live with latent TB.
How does California’s TB rate compare to the country?
Public health officials reported that California’s annual TB incidence rate was 5.4 cases per 100,000 people last year, nearly double the national incidence rate of 3.0 per 100,000 in 2023.
In 2024, 2,109 California residents were reported to have TB compared to 2,114 in 2023 — the latter was about the same as the total number of cases reported in 2019, according to the state Department of Public Health.
The number of TB cases in the state has remained consistent from 2,000 to 2,200 cases since 2012, except during the COVID-19 pandemic from 2020 to 2022.
California’s high TB rates could be caused by a large portion of the population traveling to areas where TB is endemic, said Dr. Shruti Gohil, associate medical director for UCI Health Epidemiology and Infection Prevention.
Nationally, the rates of TB cases have increased in the years following the COVID-19 pandemic, which “was in some ways anticipated,” said Gohil. The increasing number of TB cases nationwide could be due to a disruption in routine care during the pandemic and a boom in travel post-pandemic.
Routine screening is vital in catching latent TB, which can lie dormant in the body for decades. If the illness is identified, treatment could stop it from becoming active. This type of routine screening wasn’t accessible during the pandemic, when healthcare was limited to emergency or essential visits only, Gohil said.
When pandemic restrictions on travel were lifted, people started to travel again and visit areas where TB is endemic, including Asia, Europe and South America, she said.
To address the uptick in cases and suppress spread, Gov. Gavin Newsom signed Assembly Bill 2132 into law in 2024, which requires adult patients receiving primary care services to be offered tuberculosis screening if risk factors are identified. The law went into effect in 2025.
What is TB?
In the United States, tuberculosis is caused by a germ called Mycobacterium tuberculosis, which primarily affects the lungs and can impact other parts of the body such as the brain, kidneys and spine, according to the Centers for Disease Control and Prevention. If not treated properly, TB can be fatal.
TB is spread through the air when an infected person speaks, coughs or sings and a nearby person breathes in the germs.
When a person breathes in the TB germs, they settle in the lungs and can spread through the blood to other parts of the body.
The symptoms of active TB include:
- A cough that lasts three weeks or longer
- Chest pain
- Coughing up blood or phlegm
- Weakness or fatigue
- Weight loss
- Loss of appetite
- Chills
- Fever
- Night sweats
Generally, who is at risk of contracting TB?
Those at higher risk of contracting TB are people who have traveled outside the United States to places where TB rates are high including Asia, the Middle East, Africa, Eastern Europe and Latin America.
A person has an increased risk of getting TB if they live or work in such locations as hospitals, homeless shelters, correctional facilities and nursing homes, according to the CDC.
People with weakened immune systems caused by health conditions that include HIV infection, diabetes, silicosis and severe kidney disease have a higher risk of getting TB.
Others at higher risk of contracting the disease include babies and young children.
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