New commercial buildings are already required to have solar panels (or plants) installed on the roof: https://www.theguardian.com/world/2015/mar/20/france-dec

New commercial buildings are already required to have solar panels (or plants) installed on the roof: https://www.theguardian.com/world/2015/mar/20/france-decrees-new-rooftops-must-be-covered-in-plants-or-solar-panels https://www.theguardian.com/world/2015/mar/20/france-decrees... https://www.architectmagazine.com/technology/france-mandates-green-roofs-for-all-new-commercial-construction_o https://www.architectmagazine.com/technology/france-mandates...