1. World Urbanization Prospects, UN Department of Economic and Social Affairs, 2014.
2. IPCC Fifth Assessment Report, Intergovernmental Panel on Climate Change (IPCC), 2014
3. (b) T.A. Boden, G. Marland, R.J. Andres, National CO2 Emissions from Fossil-Fuel Burning, Cement Manufacture, and Gas Flaring, (2017) 1751-2014.
4. (a) U.S. Environmental Protection Agency: https://www.epa.gov/ghgemissions/global-greenhouse-gas-emissions-data; IPCC Fifth Assessment Report, Intergovernmental Panel on Climate Change (IPCC), 2014; https://www.ipcc.ch/site/assets/uploads/2018/02/ipcc_wg3_ar5_full.pdf;
5. (b) T.A. Boden, G. Marland, R.J. Andres, National CO2 Emissions from Fossil-Fuel Burning, Cement Manufacture, and Gas Flaring, (2017) 1751-2014.