Since the Environmental Protection Agency informed the White House in December 2007 of its finding that carbon dioxide emissions are a danger to the United States and proposed significant cuts in motor vehicle emissions, the agency’s regulatory efforts have been halted. In a March 12 letter to EPA Administrator Stephen Johnson, House Oversight and Government Reform Committee Chairman Henry Waxman cites information provided to the Committee by seven senior EPA officials on how a major effort to comply with the Supreme Court ruling in Massachusetts v. EPA has beeen blocked.