The former regulators' warning comes in the wake of the U.S. Environmental Protection Agency's announcement to roll back dozens of air and water protections.

The EPA administrator says he is rolling back dozens of environmental rules, including those crucial to California programs on climate change and electric vehicles, and closing offices that worked to lower pollution in poor communities.

The Trump administration is rolling back several major climate policies, including two rules that target planet-warming pollution from vehicles and power plants, in a major blow to America’s progress on climate action.