1. China, 1999, China climate change country study, Research Team of China Climate Change Country Study, 1999, p. 238.
2. DOE, 2000, Annual Energy Review, 2000, DOE/EIA-0384(2000), Table 1.
3. IPCC, 1994, Radiative forcing of climate change, the 1994 Report of the Scientific Assessment Working Group of IPCC, p. 16.