Even if it could be used to remove polluting impurities, at best you'd have something that burned to rich creamery carbon dioxide. Which is better than belching toxic smoke into the air, but still has the greenhouse gas problem.
I'm guessing coal is a somewhat different case because you wouldn't get hydrocarbons out; the hydrogen isn't there. (You could add it, but my impression is that coal liquification and gasification projects generally aren't worth the trouble in environmental footprint per joule extracted.)
no subject
I'm guessing coal is a somewhat different case because you wouldn't get hydrocarbons out; the hydrogen isn't there. (You could add it, but my impression is that coal liquification and gasification projects generally aren't worth the trouble in environmental footprint per joule extracted.)