EPA Vehicle Emissions Rule
Massachusetts petitions for review after the EPA denies a rulemaking petition seeking limits on greenhouse gas emissions from new motor vehicles. The Court holds that the Clean Air Act authorizes the agency to regulate such emissions and that Massachusetts has standing to challenge the denial.
Massachusetts, et al. v. Environmental Protection Agency, et al.549 U.S. 497, 127 S. Ct. 1438, 167 L. Ed. 2d 248 (2007)
In October 1999, nineteen private organizations filed a rulemaking petition with the EPA requesting regulation of greenhouse gas emissions from new motor vehicles under section 202 of the Clean Air Act. The petition asserted that carbon dioxide and other gases were heat-trapping greenhouse gases that had accelerated climate change, with carbon dioxide as the most important contributor according to the IPCC's 1995 report. The EPA received more than fifty thousand comments after requesting public input in 2001. A National Research Council report from 2001, prepared at the White House's request, stated that greenhouse gases from human activities were causing surface air temperatures to rise. On September 8, 2003, the EPA denied the petition on two grounds: the Clean Air Act did not authorize regulation of greenhouse gases from motor vehicles, and even assuming authority, the agency would not regulate due to scientific uncertainty about causation and concerns that regulation would conflict with the President's comprehensive approach involving voluntary programs and international negotiations. The denial order referenced Congress's decision in 1990 not to enact binding emissions limitations and the political history of climate change issues. Petitioners including the Commonwealth of Massachusetts and other states and private organizations then sought review in the United States Court of Appeals for the District of Columbia Circuit. The D.C. Circuit denied the petition for review in 2005. The Supreme Court granted certiorari in 2006 to address the issues raised by the denial. Massachusetts submitted affidavits showing that global sea levels rose 10 to 20 centimeters over the 20th century, already causing loss of coastal land owned by the Commonwealth, with projections of further inundation by 2100. The United States transportation sector alone emitted more than 1.7 billion metric tons of carbon dioxide in 1999, accounting for over 6 percent of worldwide emissions.