[Departement_IRSTEA]Territoires [TR1_IRSTEA]DTAM [Axe_IRSTEA]DTAM-QT1-INEGALITESNational audienceThis article proposes an analysis of the conflicts surrounding the creation of the Calanques National Park, near Marseille, the first periurban national park in Europe. Our approach has embraced the analytical framwork of environmental effort. Environmental effort may be defined as the socially differentiated and potentially unfair contribution of social actors to public environmental-protection policies. As part of a wider environmental inequality framework, this sociological survey, initiated in 2008, has gatgered a variety of data. We shall look at both the importance of procedures implemented and the role these procedures play in the environ...