Human societies around the world are confronted by multiple changes, which causes often depend on access to renewable natural resources. The Green research unit focuses on interactions between ecological and social dynamics, collective decision-making processes, and modes of appropriation of ‘Nature’. It develops knowledge, methods and tools to analyze the evolution of social and ecological systems (SES), to represent various regulation systems, and to improve the capacity of the actors concerned to apprehend these complex systems on which they depend and which they influence.