For a joint association, SMOYS (Syndicat Mixte Orge Yvette Seine) in France with a new extended perimeter, we provided a territorial pre- diagnosis on a scope of 65 local authorities, defining carbon neutral guidelines prior to the definition of a 2050 strategy . energy (solar potential, energy efficiency, decarbonisation of heat etc .), mobility (rollout of electric vehicle charging infrastructure etc .), environment (nature capital and carbon sinks), quality of life, public realm, and local community engagement.