For addressing climate change, China is stepping up its efforts to achieve the target of reducing CO_2 emissions per unit of GDP by 40 to 45 percent by 2020 from the 2005 levels. So it is necessary to estimate China's greenhouse gas (GHG) emissions in details and to analyze its characteristics. GHG inventories of China are estimated from 1991 to 2012, covering energy activities, industrial processes and agricultural activities, and including CO_2, CH_4, N_2O, CF_4, C_2F_6, SF_6 and HFC-23. China's total GHG emissions grew from 3368.8 Mt CO_2 equivalent (CO_2eq) to 10656.3 Mt CO_2eq. The emission from the energy activities grew from 2621.8 to 8665.6 Mt CO_2eq, and the emission from the secondary sector grew from 1925.9 to 7515.2 Mt CO_2 eq. In greenhouse gas type, CO_2 emissions rose from 2591.1 to 9097.5 Mt accounting for the largest proportion. With the complete decomposition model, the change of GHG emissions from industrial sectors is analyzed quantitatively. The results indicate that only the energy intensity effect contributes to GHG emission mitigation, the largest increase is caused by economic activity effect, the structure effect does not achieve emissions reduction, and the emission factor effect is insignificant.
