Actually they do want to kill the coal industry, he said so:
""So if somebody wants to build a coal-powered plant, they can; it's just that it will bankrupt them, because they're going to be charged a huge sum for all that greenhouse gas that's being emitted," Obama said during a 2008 interview with the San Francisco Chronicle's editorial board.
"Under my plan of a cap-and-trade system, electricity rates would necessarily skyrocket. Even regardless of what I say about whether coal is good or bad," Obama said in 2008. "Because I'm capping greenhouse gases, coal power plants, you know, natural gas, you name it -- whatever the plants were, whatever the industry was, they would have to, uh, retrofit their operations. That will cost money. They will pass that money on to consumers."