Trump Moves to Dismantle Legal Foundation of US Climate Regulations

US President Donald Trump is set to revoke a key federal scientific determination that greenhouse gases endanger public health — a move that would dismantle the legal backbone of many US climate regulations.

The decision targets the 2009 “endangerment finding,” issued during the administration of Barack Obama. That finding concluded that six greenhouse gases, including carbon dioxide, threaten public health and welfare by contributing to climate change. It has since served as the foundation for federal limits on emissions from vehicles, power plants and oil and gas operations.

White House Press Secretary Karoline Leavitt described the planned action as the “largest deregulatory move in American history.” Trump is expected to appear alongside Environmental Protection Agency Administrator Lee Zeldin to formally announce the rollback.

Origins in Supreme Court ruling

The endangerment finding followed the 2007 Supreme Court ruling in Massachusetts v. EPA, which held that greenhouse gases qualify as pollutants under the Clean Air Act. The court directed the Environmental Protection Agency to determine whether such emissions pose a danger to public health and welfare.

Although the original determination focused on vehicle emissions, it later became the legal basis for a wide range of federal climate rules. Repealing it would also eliminate federal greenhouse gas standards for automobiles and could weaken existing limits on carbon dioxide from power plants and methane from oil and gas facilities.

Administration’s rationale

According to draft documents, the administration argues that greenhouse gases should not be regulated like traditional pollutants because their effects are global and indirect rather than localized. It contends that domestic regulation alone cannot meaningfully address worldwide climate change.

The proposal also challenges aspects of the prevailing scientific consensus on human-driven climate change, citing a report commissioned by a Department of Energy working group that included climate skeptics. That report drew criticism from researchers, who said it contained significant errors and mischaracterized scientific studies. The panel was later disbanded after legal challenges from environmental organizations.

Economic claims and expected court battle

The administration has asserted that rescinding the endangerment finding would yield more than $1 trillion in regulatory savings and reduce new vehicle costs, though detailed calculations have not been publicly outlined.

Environmental advocates argue that such estimates fail to account for public health benefits, fuel savings and avoided climate-related damages. They also warn that weakening emissions standards could disadvantage US automakers in the global shift toward electric vehicles.

Legal experts anticipate swift court challenges once the final rule is published, setting the stage for another high-stakes battle over federal authority to regulate greenhouse gases under the Clean Air Act.