To steer societies development towards sustainability has been a sustained concern for public actors, from the earlier implementation of sustainable development public policies to the more recent emergence of « ecological transition » policies in France. The goal of the Ecological transition of coastal territories and the APCLIMTER projects is therefore to investigate how the emergent problematics of global change are dealt with by public actors in the frame of « transition policies ». To do so a team of researchers specialized in public policy analysis and in the sociology of science will be mobilized. The projects will focus on the development and implementation of these policies at the territorial scale, then the « Nouvelle Aquitaine » region has been chosen as study site. Indeed this region of which a large fraction of the territory is coastal is particularly vulnerable to the sea related impacts of climate change.