On April 2, 2007, the U.S. Supreme Court ruled that Massachusetts had standing to sue EPA, and that EPA had the authority and duty to regulate carbon dioxide emissions from automobiles. WLF had a brief urging the Court to reject the an appeal. WLF argued that Congress did not intend to regulate carbon dioxide and a court ordering the EPA to do so would, in effect, constitute a “back door” method of implementing the unratified Kyoto Treaty regulating greenhouse gases, and cause severe harm to our economy.