1. Annual Energy Outlook 2014;Energy Information Administration:Washington, DC, 2014.http://www.eia.gov/forecasts/aeo.
2. National Greenhouse Gas Emissions Data;U.S. Environmental Protection Agency:Washington, DC, 2014.http://www.epa.gov/climatechange/ghgemissions/usinventoryreport.html.
3. The 2011 National Emissions Inventory;U.S. Environmental Protection Agency:Washington, DC, 2013.http://www.epa.gov/ttnchie1/net/2011inventory.html.
4. Obama Administration Finalizes Historic 54.5 MPG Fuel Efficiency Standards.http://www.whitehouse.gov/the-press-office/2012/08/28/obama-administration-finalizes-historic-545-mpg-fuel-efficiency-standard.
5. Environmental Protection Agency and the National Highway Traffic Safety Administration, No. EPA-HQ-OAR-2010-0162 and No. NHTSA-2010-0079 (2011) .