1. IEA. Key world energy statistics 2011. Paris, France; 2011.
2. Carbon cycling in earth systems – a soil science perspective;Janzen;Agric Ecosyst Environ,2004
3. UNFCCC. Kyoto protocol to the United Nations framework convention on climate change. United Nations, New York, USA; 1998.
4. The global climate challenge: recent trends in CO2 emissions from fuel combustion;Demirbas;Energy Educ Sci Technol Part A,2009
5. World energy assessment;Goldemberg,2000