4International Energy Agency (IEA).Key world energy statistics 2008[EB/OL].http://www.iea.org/.
5Kennedy, C.A., Ramaswami, A., Carney, S., Dhakal, S. Greenhouse gas emission baselines for global cities and metropolitan regions[EB/OL].http://www.urs2009.net/.
6Mitchell A, Wood D. Toward a Theory of Stakeholder Identification and Salience: Defining the Principle of Who and What Really Counts[J]. The Academy of Management Review, 1997, 22 (4) : 853-886.