Emission trading is a new method of protecting environment in China. There are many cases of environment trading in practice. Many scholars have made much research on it. They focus on these main problems, including, but not being limited to - (1) How about the relations among Sources of Carrying Capacity of Environment (SCCE), Emission trading, Surplus emission permits, Emission trading? (2) What are the basic meaning and feature and applicable condition of emission trading? (3) What is the difference betw...