Cars, Trucks, and Climate: EPA Regulation of Greenhouse Gases from Mobile Sources [March 13, 2014]   [open pdf - 391KB]

"On February 18, 2014, President Obama directed the Environmental Protection Agency (EPA) and the National Highway Traffic Safety Administration (NHTSA) to develop a second round of greenhouse gas (GHG) emission and fuel economy standards for medium- and heavy-duty trucks. The standards, which will affect trucks beginning with the 2019 model year, are to be proposed by March 2015 and finalized a year later. The standards will be the fourth set of GHG emission standards for mobile sources. Under standards promulgated in October 2012, GHG emissions from new cars and light trucks (i.e., SUVs, minivans, and most pickup trucks) will be phased in, beginning with model year (MY) 2017. When fully phased in (2025), emissions will be reduced about 50% compared to 2010, and average fuel economy (CAFE) standards will rise to nearly 50 miles per gallon. EPA had previously set GHG emission standards for MY2012-2016 cars and light trucks and for MY2014- MY2018 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 the Clean Air Act (CAA) will be used, and to promulgate regulations."

Report Number:
CRS Report for Congress, R40506
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