Since the 1990s, territorial foresight strongly developed in the trail of the decentralization and the accentuation of uncertainties and risks which weigh on territories. But, this increased use to foresight tool is not always exempt from ambiguity. It brings into question the intertwining between a forward-looking approach, which envisages a plurality of futures, and public policies were directed to the treatment of a short-term problem. To contribute to this debate, the article suggests returning on the foresight "Massif des Landes de Gascogne à l'horizon 2050", which answers a request of support for the territorial action after the storm Klaus (2009) and research agenda on the options for forest adaptation to climate change. By structuring their reflection around a theory of the political change, the authors highlight the advantage of a foresight approach to rethink issues, to foster public debate and to define adaptations strategies. But, the exercise leads on the Landes de Gascogne area, where the territory tends to become confused with the forest, also shows the difficulty overtaking scopes of interventions and actors' coalitions established to implement new compromises and ways of coordination.