Trump-Era EPA Moves to Dismantle Foundational Climate Rule, Sparking Legal and Environmental Backlash

In a sweeping move with far-reaching implications for U.S. climate policy, the Trump administration announced plans to revoke the Environmental Protection Agency’s (EPA) 2009 "endangerment finding", the legal cornerstone that underpins all federal regulations on greenhouse gas emissions. If finalized, this repeal could unravel decades of climate regulations, including those limiting emissions from vehicles, power plants, and industrial operations.

EPA Administrator Lee Zeldin unveiled the plan at a car dealership in Indiana, flanked by Energy Secretary Chris Wright. Calling it the largest deregulatory action in U.S. history, Zeldin claimed repealing greenhouse gas standards would save $54 billion annually. The proposal is set to undergo a public comment period before becoming law.

Environmental advocates were quick to denounce the move. “With today’s announcement, the EPA is telling us in no uncertain terms that U.S. efforts to address climate change are over,” said Abigail Dillen, president of Earthjustice. “For the industries that contribute most to climate change, the message is ‘pollute more.’ For everyone feeling the pain of climate disasters, the message is ‘you’re on your own.’”

The endangerment finding was issued under President Obama following the U.S. Supreme Court's 2007 Massachusetts v. EPA ruling, which affirmed the EPA's authority to regulate greenhouse gases under the Clean Air Act. That scientific assessment has since underpinned a host of emission-related regulations across sectors, including tailpipe standards, aircraft CO₂ limits, and methane controls in the oil and gas industry.

Zeldin argued the agency lacks authority to regulate greenhouse gases, citing the 2024 Supreme Court decision that weakened the so-called Chevron deference, a legal doctrine that had given federal agencies interpretive latitude. “We do not have that power on our own,” Zeldin stated. “If Congress wants to amend the Clean Air Act to require regulation of CO₂, we will follow its lead.”

The administration’s move stands in sharp contrast with recent global developments. Just last week, the International Court of Justice warned that governments failing to curb emissions could be committing internationally wrongful acts under treaties like the Paris Agreement. Domestically, the administration has already dismissed the authors of the U.S. National Climate Assessment, which outlines climate impacts nationwide.

Reactions from industry were mixed. The American Trucking Associations welcomed the rollback, claiming Biden-era tailpipe rules would “cripple the supply chain.” Ford Motor Co. responded more cautiously, calling for a “stable standard” aligned with science and customer needs. Other major automakers declined to comment.

Meanwhile, state regulators expressed alarm. California Air Resources Board Chair Liane Randolph condemned the move as choosing “polluter fantasyland over proven science.”

Legal challenges are widely expected as environmental groups, states, and public interest organizations prepare to fight what many see as an existential threat to America’s climate agenda.

Dismantling foundational climate rules pushes compliance risk into state, private-litigation and international channels - and US corporates now need disclosure that stays coherent regardless of which channel ends up dominating. Our sustainability-due-diligence and ESG-strategy teams help clients build compliance infrastructure that survives federal recalibration without needing to be rebuilt.