How an unlikely mix of environmentalists and free-market conservatives hammered out the strategy known as cap-and-trade.  By Richard Conniff, Smithsonian magazine, August 2009.

For a strange alliance of free-market Republicans and renegade environmentalists, cap and trade, or what was once called emissions trading, represented a novel approach to cleaning up the world—by working with human nature instead of against it.

via The Political History of Cap and Trade  | Smithsonian Magazine.