Baseline Issues for Forest-Based Carbon Sink Project on Clean Development Mechanism(CDM) Selection and Evaluation of Preferential Development Area for Afforestation and Reforestation Project under CDM in China Influence of afforestation, reforestation, forest logging, climate change, CO2 concentration rise, fire, and insects on the carbon sequestration capacity of the forest ecosystem Sources of Uncertainty and its Estimating Approach for Estimating Greenhouse Gas Emission by Sources and Removals by Sinks from Afforestation and Reforestation under CDM Analyses on Leakage Issues of Forestry Sequestration Project