Human activities generate local environmental impacts (on the quality of water, air and soil), as well as global impacts affecting the ecological carrying capacities at world level. The proposed methodology aims at representing both local and global impacts of a given activity, taking into account both direct and indirect impacts. The final objective is to establish an environmental dashboard based on a set of relevant indicators, in order to assess local and global environmental impacts caused by a given activity. This paper will present the details of this methodology.