1. Hua Zepeng. Energy economics [M]. Dongying, Shandong: China University of Petroleum Press, 1991 (in Chinese).
2. National Bureau of Statistics of China. China statistical yearbook (2001–2007) [M]. Beijing: China Statistics Press, 2001–2007 (in Chinese).
3. Intergovernmental Panel on Climate Change (IPCC). Fourth assessment report: Climate change [R]. 2007.
4. Hansen J, Sato M. Ruedy R, et al. Global temperature change [J]. PNAS, 2006, 103: 14288–14293.
5. National Bureau of Statistics of China. China statistical yearbook 2007 [M]. Beijing: China Statistics Press, 2007 (in Chinese).