I used to work in a plant that burned coal for a large part of it's energy.
I may have some of the facts wrong around the edges...
But for the most part I can tell you the facts.
Coal burns very cleanly under properly controlled conditions.
Only those who believe that CO2 is a deadly environmental destroyer would think otherwise...
It is a fact that plants that burn coal often burn it differently (less environmentally) during daylight hours...Becuase the neighbors PERCIEVE pollution where there isn't any...In fact, what they percieve as pollution is actually the absence of pollution (more smoke vs. less smoke).