If approved, the EPA’s proposal would rescind the 2009 decision that set forth a legal basis to regulate greenhouse gases as pollutants. Known as the "endangerment finding," it allowed the EPA to limit emissions from vehicles, power plants, and oil and gas companies under the Clean Air Act.

The Trump administration is moving to repeal a scientific finding that has long been the legal basis for U.S. action to fight climate change. Author and science writer David Wallace-Wells joins Erielle Reshef to explain more on the implications of this move,