Former Representative Henry Waxman breaks down the options for the president’s final 18 months in office:

Executive authority, especially under the Clean Air Act, provides numerous paths for meaningful climate action. It can deliver popular, pro-growth, business-friendly pollution reductions that today are not possible through legislation. That is the legacy of one of our most important laws, and it can shape the legacy of this administration and the next.

Waxman goes on to list potential options to reduce emissions in aviation, cars and trucks, and other industrial sectors outside of electricity. It’s worth reading the whole thing.