The British environmentalist Jonathon Porritt once said that ‘Having written the last two general election manifestos for the Ecology Party, I would be hard put even now to say what our ideology is’ (Porritt, 1984a, p. 9). In this chapter I want to establish some of the ground rules for this ideology, and in doing so I will build on two points established in the Introduction: first, that ecologism is not the same as environmentalism, and second, that environmentalism is not a political ideology.