We are already burning coal for power generation, whether we like it or not. I have wondered why we don't "recycle" plastic by shoveling it into the same furnace and a) get some energy out of it, and b) solve the landfill problem. That should be carbon neutral, since burning X tons of plastic is X tons of coal we didn't burn.
My question wasn't so much about the contradiction between regulating & banning authority, but questioning the authority to do either in the first place. I.e. I don't understand why gambling must necessarily be considered to be inter-state. But I now think this is unrelated to the point you were trying to make.