1. International Energy Agency, Key World Energy Statistics 2007, 〈http://www.iea.org/Textbase/stats/index.asp〉; 2007.
2. Energy Information Administration, International energy outlook 2008—highlights, Report DOE/EIA-0484, June 2008.
3. IPPC, Climate change 2007: Impacts, adaptation and vulnerability. contribution of working group ii to the fourth assessment report of the intergovernmental panel on climate change. Cambridge, UK: Cambridge University Press; 2007.
4. U.S. Central Intelligence Agency, The World Factbook 2008, 〈https://www.cia.gov/cia/publications/factbook/index.html〉; 2008.
5. An overview of CO2 mitigation options for global warming—emphasizing CO2 sequestration options;Yamasaki;Journal of Chemical Engineering of Japan,2003