Beijing provides a good example of this problem, since the city's economic activity is highly concentrated, and its total ABR-215062 consumption has been increasing rapidly for more than a decade. In 2000, 54.3% of the energy consumption was provided by coal (Beijing Municipal Commission of Development and Reform, 2012). As a result of continuous efforts to adjust the city's energy structure, this proportion fell to 30% by 2010, and this level was lower than that for high-quality energy sources such as natural gas and electricity, which accounted for about 70% of total energy consumption (Beijing Municipal Commission of Development and Reform, 2012). This adjustment mitigated the smog problem, but did not solve it because total carbon emission remained high. In 2011, Beijing emitted 5037 t more carbon than in 2002, of which 93.8% was from energy consumption (People's Tribune, 2013). As the energy consumption and carbon emission are still high, the city's managers have begun to ask whether a better understanding of the energy consumption structure could improve their management of energy conservation and carbon emission reduction activities. To provide the required information, it is necessary to determine how to trace the city's energy metabolic processes, how to evaluate the attributes of the energy consumption structure, and how to determine the required carbon emission reduction by each sector. To solve these problems, it is necessary to analyze the energy consumption structure based on the carbon footprint of each sector. The results of such an analysis can improve efforts to conserve energy and reduce carbon emission.