1. U.S. EPA 2014 http://epa.gov/climatechange/ghgemissions/
2. National Climate Assessment 2014 http://nca2014.globalchange.gov/
3. Solar powered charge stations for electric vehicles;Goldin;Environmental Progress and Sustainable Energy,2014
4. U.S. EPA 2014 www.epa.gov/
5. U.S. EPA 2014 www.epa.gov/planandbudget/strategicplan