The Trump administration plans to overturn the 2009 "endangerment finding," a legal ruling that allows the government to regulate greenhouse gases under the Clean Air Act. Environmental organizations, such as Earthjustice and the National Resources Defense Council, have already promised to fight the move in court.

While a spokesperson for the EPA labeled the original finding harmful to the economy, climate activists argue that scrapping it is a direct assault on climate action that will put public health at risk. The administration expects the repeal, which targets rules for vehicle exhaust, to save money. However, experts warn the change could lead to higher healthcare expenses and more severe damage from a warming planet.