Greenhouse gas emission inventory from energy consumption of Beijing based on input-output analysis
基于投入产出法的北京能源消耗温室气体排放清单分析

As a result of great energy consumption, there are significant amount of greenhouse gases (GHG) emitted from cities. Recent studies focused on GHG mitigation in urban region. In this study, the amount of GHG emission in Beijing, including CH4 and N2O, was calculated based on input-output method. In 2007, the amount of GHG resulted from energy consumption was 35.3172 Mt CO2 equivalent, in which CO2, CH4 and N2O was 35.1440 Mt, 1734.32 t and 435.83 t, respectively. The industry sector was the biggest emitter, accounting for 98.96% of CO2, 88.48% of CH4, and 98.99% of N2O emissions. In final consumption sectors, emission from the government was responsible for 15% of the total emissions of the three kinds of GHG, which was much higher than those from rural and urban households. Emissions embodied in exports accounted for over 40% of GHG emissions in final demand sectors, over ten times that embodied in imports. This demonstrated that Beijing was an emission exporter. The average emission efficiency in Beijing was slightly higher than the average level of the whole country. It would be necessary to control emission efficiency through industry structure adjustment and energy consumption in order to mitigate GHG emissions in Beijing.