Article de Marion Sestier (EnvIM 2020)   In the midst of the Covid-19 mask shortage during the French spring sanitary lockdown, solidarity sprung through local citizen and associations-led initiatives such as home-sewed masks, food deliveries to isolated people, redistributing food stocks of closed restaurants, or printing plastic face shields[1]. Such initiatives showed strong interest for collective and do-it-yourself projects. They grew in parallel of a national conversation on environmental and