Investigation into the PBBC shows that the company has a relatively simple management structure and clear organizational boundary; its energy consumption is categorized into three competent departments: logistics system, maintenance system as well as operating system. Based on the company’s energy management system, its GHGs quantification boundary can be set as operating system and supporting system, direct and indirect emissions from the two systems can be respectively calculated; it can be seen from the quantification of GHGs from the PBBC in 2012 that for public transportation companies, their major emission source is the operating vehicles, which sharing 96% of the total emissions, while emissions from the supporting system is relatively small.
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