Bloomberg: The U.S. Chamber of Commerce’s reported flip-flop on climate change, conveyed in a press release and a Washington news conference, was a hoax perpetrated by a group that stages stunts to satirize corporate positions. A New York-based group calling itself the Yes Men issued a phony press release and the text of a purported speech by Chamber President Thomas Donohue today under the chamber’s letterhead, said Jacques Servin, a Yes Men member. The imposters also held a news conference at …