The paper gives a presentation of the global /local interplay in the development of the green thought during the recent years. It claims that the relation between nature for whatever we call "nature" today) and society as a whole is the main preoccupation of political ecology. And that the study of this relation in its historic specificity drives the green movement to attempt to extend "rights" toward three distinct directions: the Nature, by making it a legal Subject, the other (the different, the oppressed, the undeveloped) and the Future Generations (by establishing the term sustainability). These directions make it radical by definition and offer a new agenda, extremely useful for geographers, since the socially constructed nature of our era cannot be absent from any urban or regional preoccupations.
