Re: I'd be amazed if they intend to power them with coal.
Coal might last 4-500 years, but the atmosphere won't.
If we exceed ~800-850ppm CO2 then it's game over for most complex life on the planet and almost certain extinction for all terrestrial animals exceeding 20kg adult mass
Ironically, most of the planet's oil deposits date from (and are a product of) the last time that event occurred - the Permian Extinction
To give an idea how bad things were back then - just before the extinction, global oxygen and climactic conditions were similar to what they are now. Just after it, oxygen levels went to 12% and stayed there for ~10k years, It took ~10 MILLION years for coal to start forming again
Humans (most mammals and most birds) can't survive at less than 16-17% oxygen long-term. We drown in our own lungs after a while. It's called altitude sickness and it's a nasty way to go