This thesis analyses the conditions for the promotion of ecological citizenship, using the tools of political theory. I examine the role of the state, the green state, the green public sphere and civil society in the articulation of ecological citizenship. The dominant position in this debate is that states should be actively involved in the greening of citizenship, using different strategies to encourage ecological habits and values among citizens. These possibilities are analysed and assessed. Some have argued, drawing on studies of the ecological reform of the state, that in order to foster ecological citizenship, states should undergo transformations so as to become green states. This view is examined with a focus on the difference betw...