2[3]Tim Hayward.Political Theory and Ecological Values[M].Polity Press,1988.
3[4]John Barry.Sustainability,Political Judgment and Citizenship:Connecting Green Politics and Democracy,in Doherty,B.and Marius de Geus,Democracy and Green Political Thought[C].London and New York:Routledge,1996.
4[5]Doherty,B.and Marius de Geus.Democracy and Green Political Thought[C].London and New York:Routledge,1996.
5[6]Porritt,J.Seeing Green:The Politics of Ecology Explained[M].Oxford:Blackwell,1984.
6[7]Barry,J.Sustainability,Political Judgment and Citizenship:Connecting Green Politics and Democracy,in Doherty,B.and Marius de Geus.Democracy and Green Political Thought[C].London and New York:Routledge,1996.