You can tell when the politicians are getting serious about an issue: they stop taking cheap shots at one another and suddenly become pragmatic. Amazingly, that's happening right now on global warming. Just as the Nobel Prize-winning Intergovernmental Panel on Climate Change warns of "abrupt and irreversible" damage if we don't take immediate action, a serious piece of climate legislation is beginning to pick up speed in the U.S. Senate.
America's Climate Security Act, a bipartisan bill co-sponsored by Senators Joe Lieberman and John Warner, would create a cap-and-trade system to reduce greenhouse-gas emissions 65% below 1990 levels by 2050. It has made it...