The Trump admin and Republicans rolled back a ton of clean air regulations: https://www.nytimes.com/interactive/2020/climate/trump-environment-rollbacks-list.ht

The Trump admin and Republicans rolled back a ton of clean air regulations: https://www.nytimes.com/interactive/2020/climate/trump-environment-rollbacks-list.html https://www.nytimes.com/interactive/2020/climate/trump-envir... "The bulk of the rollbacks identified by the Times were carried out by the Environmental Protection Agency, which weakened Obama-era limits on planet-warming carbon dioxide emissions from power plants and from cars and trucks; removed protections from more than half the nation’s wetlands; and withdrew the legal justification for restricting mercury emissions from power plants."