This study is the result of a collective action initiated by ADEME and conducted by Resilio, to assess the environmental impact of the network throughout France. Four Internet Service Providers (ISPs) were involved: Orange, Bouygues Telecom, SFR and Iliad. The results are presented for the whole of France and per subscriber, on fixed and mobile networks, and calculated for 16 environmental indicators, including climate change, consumption of natural resources and fine particles.