Supporters of the Waxman-Markey climate bill have not seriously disputed the extreme costs and the negligible benefits estimated by critics of the cap-and-trade proposal. I must confess that I was expecting a real fight, but some very important markers seem to have been laid down in this legislative debate. Waxman-Markey supporters are going beyond the math to dispute the conclusion being drawn from the math. And that conclusion, which logically follows, is that cap-and-trade for carbon dioxide is a very bad deal.…