3Wackernagel M,Rees W.Our ecological footprint:reducing human impact on the earth[M].Canada:Gabriola Island,BC:New Society Publishers,1996.
4William R,Mathis W.Urban ecological footprints:why cities cannot be sustainable-and why they are a key to sustainability[J].Environmental Impact Assessment Review,1996,16(4/5/6):223-248.
6Swisher J N.Tools and methods for integrated resource planning[R].UNEP Collaborating Centre on Energy and Environment,Risφ National Laboratory,Denmark,1997.