1. U.S EPA (2016) Climate change indicators: global greenhouse gas emissions. Climate Change Indicators in the United States, US EPAs
2. U.S EPA (2016) Technical documentation: U.S. Greenhouse Gas Emissions
3. http://timesofindia.indiatimes.com/home/environment/global-warming/Greenhouse-gases-India-fourth-biggest-emitter-but-lags-far-behind-top-three/articleshow/47807927.cms
4. Climate change indicators in the United States: atmospheric concentrations of greenhouse gases.
www.epa.gov/climate-indicators
www.epa.gov/climate-indicators
. Updated Aug 2016
5. Hoornweg D, Bhada-Tata P (2012) What a waste: a global review of solid waste management. Urban Development & Local Government Unit, World Bank, Washington, DC