The Trump administration is set to announce a plan to scrap a landmark finding that greenhouse gases are harmful to the environment, severely curbing the federal government's ability to combat climate change.
Known as the "Endangerment Finding", the 2009 order from then-President Barack Obama allowed the US Environmental Protection Agency (EPA) to create rules to limit pollution by setting emissions standards.
The US is a major contributor to global climate change, and ranks second only to China which emits more planet-warming gases like carbon dioxide – and the US still emits more per person.
Experts have warned that the move could have a devastating impact on the environment.
EPA administrator Lee Zeldin is expected to formally make the announcement at an event in Indiana alongside Governor Mike Braun on Tuesday afternoon.
