As the U.S. Supreme Court prepares to take up the issue of climate change, some unusual alliances are forming - and corporate America finds itself on both sides of the debate... Supporting federal regulation are the attorneys general of 13 states, environmental groups, a coalition of church groups, native Americans living in Alaska - and utility companies Entergy and Calpine, as well the Aspen Skiing Co. Such bulwarks of the Fortune 500 as General Electric and Wal-Mart also say they favor federal regulation of greenhouse gases, although they have not joined this case. On the other side are the EPA [US Environmental Protection Agency], about a dozen mostly-industrial states, the American Petroleum Institute, utilities, car dealers and automakers Daimler Chrysler, Ford and General Motors. [also refers to positive steps taken by DuPont]