Banning coal is a complete no-brainer at this point. Has been for quite a while. Never mind climate change, it's horribly polluting. The only reason it's still remotely economically viable is because the people who burn coal don't bear the costs of their pollution. If they actually had to compensate people for all the cancer, lung disease, poisoned ground water, contaminated seafood, and other such problems they cause, coal would vanish.

It's already to the point where the ridiculous coal fans who infest our government are forcing coal power plants to remain open when their operators want to close them because they're no longer profitable to operate.

banning coal is quite cheap even ignoring the emissions and pollution side effects. England has already shut down their last coal plant and without 6 years of Trump, the US likely would have or would be planning to within the next couple years. Coal is expensive, not flexible, and horribly polluting even compared to natural gas.