Cars, Trucks, and Climate: EPA Regulation of Greenhouse Gases from Mobile Sources. Congressional Research Service, Library of Congress. James E. McCarthy and Brent D. Yacobucci. February 14, 2013.
On October 15, 2012, the Obama Administration took a major step toward reducing greenhouse gas (GHG) emissions from motor vehicles when it promulgated GHG emission standards for model year 2017-2025 light duty vehicles. Under the standards, GHG emissions from new cars and light trucks will be reduced about 50% by 2025 compared to 2010, and average fuel economy standards will rise to nearly 50 miles per gallon. EPA had previously set GHG emission standards for MY2012-2016 vehicles as well as for 2014-2018 model year medium- and heavy-duty trucks.These steps have been taken as the Congress (particularly the House) and the Administration have reached an impasse over climate issues. The Administration has made clear that its preference would be for Congress to address the climate issue through new legislation. Nevertheless, in the wake of a 2007 Supreme Court decision, it has moved forward on several fronts to define how theClean Air Act will be used and to promulgate regulations. The key to using the CAA’s authority to control greenhouse gases was for the EPA Administrator to find that GHG emissions are air pollutants that endanger public health or welfare.
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