Andrew Dobson describes and assesses the political ideology of ‘ecologism’, and compares this radical view of remedies for the environmental crisis with the ‘environmentalism’ of mainstream politics. He examines the relationship between ecologism and other political ideologies, the philosophical basis of ecological thinking, the potential shape of a sustainable society, and the means at hand for achieving it. New to this edition: remains the starting point for all students, academics and activists who want an introduction to green political theory.