the clean air act. there could be a cap and trade kind of regime. they would have to structure it differently, which means the executive and conservatives have been fighting tooth and nail to be sure it doesn't happen. if there is little political coverage in congress, it is the threat of uni rival action that has some republicans and lobbyists on the hill scurrying because they are worried about the president following through on that promise. i thought that was a big deal, the not so veiled threat. >> that explains about the president explaining it in speeches, so people understand it if he has to do it.