Environmental Protection Agency Administrator Lee Zeldin was at an Indianapolis truck dealership on Tuesday, announcing rollbacks that will undo efforts to combat climate change taken during

What is the agency actually proposing? In 2009, the EPA reached what is known as the “endangerment finding” — a determination that greenhouse gases are dangerous to human health because of their role in climate change, on which the agency’s efforts to regulate greenhouse gas emissions rests. Now, the EPA proposes rolling back that finding.

The endangerment finding underpins the EPA's ability to regulate greenhouse gases. The Trump administration is trying to reverse it.