He's not a businessman, he's a salesman.

On green energy, I'm getting the impression that some threshold is finally being passed where clean energy is picking up momentum, and won't be so easily stopped anymore. Trump may have promised coal to the former coal miners, but coal is getting too expensive, so that's unlikely to happen. On oil, with some luck, he may want to make the US less dependent on Saudi oil.

So despite his denialism, he might turn out to be okay here. Of course you can never be sure with him.