The Environmental Protection Agency scored another win in the ferocious battle over the regulation of greenhouse gases when the D.C. Circuit declined on Thursday to review its June decision upholding the agency's interpretation of the Clean Air Act. In a 6-2 vote, the court denied petitions by the U.S. Chamber of Commerce, the National Association of Manufacturers and others to rehear the case en banc -- but in a rare step, two judges issued lengthy dissents and three penned a defense of their original opinion. The one thing they all agreed on: The case is of "exceptional importance."