EarthTalk answers: Do insulating paints work? And what does Obama think of “clean” coal?

Dear EarthTalk: As I understand it, coal that is used to fuel power plants and other industrial activity is a key culprit in pollution and climate change. So what is “clean coal” and is it really? — Matthew Oliver, Minneapolis, MN
The term “clean coal” describes various processes that remove pollutants from coal, our cheapest, most [...]