President Donald Trump signed four executive orders to overhaul the Nuclear Regulatory Commission and hasten the process and deployment of new nuclear power reactors in the United States.

Trump has signed a spate of executive orders promoting oil, gas and coal that warm the planet when burned to produce electricity. Nuclear reactors generate electricity without emitting greenhouse gases. Trump said reactors are safe and clean, but did not mention climate benefits.

Trump’s firing of a federal agency head may soon spell doom for a New Deal era precedent that limited presidential power.