If burning is the worse, then maybe we can narrow down 'how' burning is the worse: After you burn ... you have ash. LOTS of ash. Clean coal has ash. LOTS of ash. I don't know how anyone can call the mountains and mountains of this stuff clean, considering its contents. With roughly 1/2 our nation's electricity coming from coal, and other power sources no longer being cheep ... the nation finds itself in a paradox ... and most don't even know it. .