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.

And EPA plans to overhaul the Biden administration’s “social cost of carbon,” a metric used to assess the cost of climate change. On his first day in office, Trump ordered EPA to weigh eliminating the “social cost of carbon” from regulatory decisions and to consider the legality of the “endangerment finding.”