Global warming has been becoming a world wide issue in which anthropogenic emission of greenhouse gases (CO 2, CH 2, N 2O) plays a main role. According to the analysis of international study on it since 1990's, this paper summarized the main contents and the methods of international research on the impacts of human activities on carbon emission. The main contents are: ① energy consumption and carbon emission, including the transform of the structure of energy consumption and the construction of low emis...