There are too many jobs that will come about in revitalizing coal, oil and gas, Keystone pipeline, the list goes on.
That would be true, except energy is already extremely cheap comparatively... Largely due to oil cartels slashing ates in order to crush American oil industry production coming out of the Bakken and Canadian production coming out of shale oil....
It might impact the cost of electricity, though natural gas also being very low in cost right now, might make natural gas fired plants competitive with ol king coal.
I would see revived coal being incredibly important economies local to coal production, and a boon to employment there, but the larger economic problems are not very likely impacted.
It would be a good thing, no doubt... just sayin.