This paper examines the ways in which utopianism permeates both radical and reformist environmentalism. Utopianism has created 'ecotopia', the radical environmentalist's utopia which has evolved from writing and action over the past half century. Ecotopianism's 'transgressive' potential in assisting change towards an ecological society is examined, and judged to be limited by idealism and unrealistic assessments of existing socio-economic dynamics. Reformist environmentalism is also considered; it is argued that this, too, can rest on unrealistic premises, reflecting liberal-capitalist utopian fantasies.