I am NOT one to defend Romney, but between 2003 and now, IIRC, "clear coal" really made a showing - which could be what he's talking about. Just to be objective (or, at least, to appear that way :P).
---------- Post added 2012-10-05 at 08:50 PM ----------
Shush you - people are "debating" now. (/sarcasm off)