Pulling out of the Paris Accord was a huge blunder on his part. Staying in it literally meant zero obligation whatsoever to the agreement... the whole thing was basically a farmers handshake saying that we will try to reduce carbon emissions. By backing out of it, denying climate change and having Pruit head the EPA just shows us that Trump doesn't trust common sense or scientific peer reviewed data that shows that the planet is in trouble in the future unless we change things around now. There is no climate change denial anymore. It's akin to calling the earth flat.
If he had stayed in the Paris Accord, he could have changed nothing and seen no penalty whatsoever... he was trying to show his nutsack a bit and prove to the conspiracy theorists that he's on their side.
And pushing to boost up coal jobs? The few thousand coal jobs that are basically irrelevant now... it's just backwards thinking and he's obviously a backwards thinking person. If the person in the White House can't listen to real scientific evidence at all, he's not fit to run the country.