Factor Analysis of CO2 Emission Changes in China

China's CO2 emission increase has attracted world's attention. This paper analyzed dominant factors that affect changes in China's CO2 emission from 1980 to 2007, which indicates that economic scale and energy saving are two major factors attributable to increase and decrease of CO2 emission, while energy conversion and population scale are less dominant factors. In the future, energy efficiency factor will still take the dominant position while energy conversion will play an increasingly important role, and economic growth rate and industrial structure transformation will become important restrictive factors while population reduction effect size will remain the least changeable factor.