1. Watt M., Johnson a., Ellis M. and Quthred H. Life cycle air emission from PV power system. Progress in Photovoltaic: Research Application 1998.
2. Power sector at a glance All India. http:// www.powermin.nic.in indian_electricity_ scenario/introduction.htm
3. IEA statistics, International Energy Agency (IEA),CO2 emission from coal combustion, Highlights-2011,Edition. http://www.iea.org/ co2highlights/co2highlights.pdf.
4. Trends in atmospheric carbon dioxide- NOAA. Earth System Research Laboratory. Global Monitoring Division, Mauna Loa, Hawai. http;//www.esrl.noaa.gov/ghg/ccgg/ trends/
5. Bihar use least power, Delhi the most-Bihar Times http://www.bihartimes.in/Newsbihar/ 2011/Aug/newsbihar15Aug/html