1. United Nations. World Urbanization Prospects: The 2014 Revision, Highlights. New York, USA; 2014. doi:10.4054/DemRes.2005.12.9.
2. SF Environment. San Francisco Citywide Greenhouse Gas Reduction Actions and Goals 2017. https://sfenvironment.org/article/citywide-actions-and-goals [accessed March 4, 2017].
3. NYC Sustainability. New York City Cliamte Change Goals 2017. http://www1.nyc.gov/site/sustainability/codes/80x50.page [accessed March 7, 2017].
4. U.S. Energy Information Administration. U.S. Total Energy Annual Review 2017. https://www.eia.gov/totalenergy/data/annual/index.php [accessed June 4, 2017].
5. NRDC, IMT. City Energy Project 2017. http://www.cityenergyproject.org [accessed February 28, 2017].