When science denial drives federal policy, the consequences are not theoretical — they are catastrophic for public health, the economy, and the planet.
In the 1970s, Los Angeles was infamous for its suffocating smog — a thick, brown haze fueled by vehicle exhaust, refinery emissions and geography that trapped pollutants beneath a stubborn inversion layer. Visibility often shrank to a few blocks. Residents wore masks, children were kept indoors during peak smog alerts, and breathing the air itself carried health risks. That era of choking pollution led to landmark clean-air protections built on scientific evidence and federal enforcement. Now, in a move that could redefine U.S. environmental policy for a generation, the Environmental Protection Agency under the Trump Administration has revoked the government’s long-standing scientific determination that greenhouse gases endanger public health and welfare — a reversal critics warn could move the country backward from hard-won environmental safeguards.
“This proposal isn’t just bad policy — it’s a reckless disregard of basic science and the health of every American,” said California Air Resources Board Chair Lauren Sanchez. “When an administration sides with polluters over people, it doesn’t just abandon commonsense climate action; it abandons our country’s future. But let me be clear: California will not back down. We will continue to stand up for the right to breathe clean air and keep driving forward in every way possible. All options are on the table.”
Photo by Matt Palmer
This decision doesn’t just revise policy — it rips out the very legal backbone of U.S. climate regulation.
The decision dismantles the 2009 “endangerment finding,” the legal and scientific foundation that allowed the federal government to regulate carbon dioxide, methane, and other climate-warming gases under the Clean Air Act. Without that finding, the EPA effectively loses its central authority to limit greenhouse gas emissions from vehicles, power plants, and major industrial sources — at the exact moment these limits are most critical.
To make matters worse, 2018 studies reported that methane emissions were 60% higher than the EPA claimed. This means the problem is far larger than official numbers suggest — and now the key regulatory tool to combat it is being stripped away.
The clock is ticking. The science is clear. And inaction now could lock in irreversible damage.
Administration officials have framed the reversal as a correction to what they describe as regulatory overreach. EPA leadership argues the change will reduce compliance costs, lower vehicle prices, and free domestic energy producers from burdensome restrictions.
But scientists say the issue is not regulatory philosophy—it is physical reality.
“This is not a political opinion. The physics of greenhouse gases trapping heat has been understood for more than a century,” said Michael E. Mann, a climate scientist at the University of Pennsylvania. “Removing the legal acknowledgment of harm doesn’t change the underlying science or the risks.”
The endangerment finding rested on a vast body of peer-reviewed research concluding that rising concentrations of greenhouse gases are warming the planet, intensifying extreme weather, raising sea levels, and worsening air quality. Global average temperatures have climbed markedly since the late 19th century, and the past decade has included some of the hottest years ever recorded.
Katharine Hayhoe, a climate scientist at Texas Tech University, said the EPA’s reversal runs counter to overwhelming scientific consensus.
“Climate change is already affecting Americans’ health, infrastructure, and food systems,” she said. “The evidence linking greenhouse gas emissions to these impacts is robust and well established.”
Public health researchers warn that higher temperatures increase the frequency of deadly heat waves and can worsen ozone pollution, aggravating asthma and cardiovascular disease.
“From a medical standpoint, climate change is a threat multiplier,” said Dr. Howard Frumkin, a former director of environmental health at the Centers for Disease Control and Prevention. “Weakening the federal response risks greater illness and preventable deaths.”
The consequences are not theoretical. The economic toll of climate change is already visible in devastated communities across the country. From coastal towns rebuilding after stronger hurricanes to Western neighborhoods reduced to ash by prolonged wildfire seasons, recovery costs now stretch into the tens of billions of dollars annually. Families face rising insurance premiums or lose coverage altogether; local governments shoulder infrastructure repairs for flooded roads, damaged schools, and strained power grids. For lower-income communities, disasters often mean permanent displacement and lost livelihoods.
City smog. Photo by Lydia
Some economists acknowledge that deregulation may offer short-term savings for certain industries, particularly fossil fuel producers and automakers. But they caution that long-term climate damages—from infrastructure losses to health care costs—could outweigh immediate economic benefits.
In coastal Florida communities such as Miami Beach and Key West, rising sea levels and recurrent “sunny day” flooding have forced millions of dollars in seawall construction, elevated roads, and upgraded drainage systems. After Hurricane Ian devastated Fort Myers in 2022, rebuilding costs climbed into the tens of billions, displacing families and shuttering small businesses. In the West, towns like Paradise—largely destroyed by wildfire—illustrate how climate-fueled disasters can erase entire tax bases overnight, leaving survivors uninsured or underinsured. Along the Gulf Coast in Lake Charles, repeated hurricanes have strained public infrastructure and driven up insurance premiums to unaffordable levels.
Deltona, FL, August 24, 2008 — Deltona Fire Department Search and Rescue (SAR) members, Randy Siebert (L) and Tony Jacinto deliver food and medications to stranded residence of this Volusia County community. Six days after the initial landfall of Tropical Storm Fay, communities are still stranded. Barry Bahler/FEMA
Economists say these mounting local burdens—from damaged schools and hospitals to rising medical costs linked to extreme heat—underscore how the long-term price of climate change is already being paid community by community, often far exceeding the regulatory savings industries may see in the near term.
We widely expect legal challenges. Several states have previously defended the endangerment finding in court, and legal scholars say the rollback could face scrutiny under administrative law standards requiring agencies to justify major policy reversals with substantial evidence.
For scientists, however, the debate ultimately returns to evidence.
“The atmosphere doesn’t negotiate,” Mann said. “If emissions rise, temperatures will rise. The risks will increase accordingly.”
The EPA’s action does not erase decades of research linking greenhouse gases to climate change. But by removing the federal government’s formal recognition of that link, it fundamentally reshapes how—and whether—the United States can respond at the national level.
How far the environmental impact will extend now depends on court rulings, state-level policies, and market forces driving clean energy. What remains unchanged, scientists say, is the trajectory of the planet’s climate system if greenhouse gas emissions continue to grow.
Governor of California responds
This decision betrays the American people and cements the Republican Party’s status as the pro-pollution party. If this reckless decision survives legal challenges, it will lead to more deadly wildfires, more extreme heat deaths, more climate-driven floods and droughts, and greater threats to communities nationwide—all while the EPA dismisses the overwhelming science that has protected public health for decades.Donald Trump may put corporate greed ahead of communities and families, but California will not stand by—we will sue to challenge this illegal action, and we will continue fighting climate pollution here in our state. We will continue to lead because the lives and livelihoods of our people depend on it. – Governor Gavin Newsom
Newsom, Governor of California, responded by labeling the “GOP the PRO-POLLUTION party.” Newsom stated it will sue the federal government to challenge the EPA’s repeal as unlawful and reckless, arguing it ignores statutory duties and settled science. Governor Gavin Newsom and state officials have vowed to take the matter to court rather than accept the rollback.
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