"Our hypothesis is that ecological transformation involves socio-environmental communities formed through joint action on a material environment, which can be set as a conjonction of practices between senses and meanings — giving birth to landscapes, life environments and matter of all kinds — analyzed in the context of solidarities — as well as conflicts of territoriality, in which human collectives associate with living matter and the environment to fight against other uses of space or to implement new ways of seeing nature. The environment as a collective work then becomes a self-sustaining call to action, which enhances the skills and legitimacy of the actors (citizens, formal and informal collectives) and their role in socio-ecological transition. We thus witness emerging environmental citizenships of a new kind that deviate from political militancy and testify to civic engagement in ordinary practices, a collective environmentalism that contributes to public action and democracy. What we call ordinary environmentalism includes environmental alliances and socio-environmental communities (with cats and cockroaches, mushrooms and noise interpretation, narrating, creating music, etc.) that have hitherto been considered negligible and we emphasize their value in democratizing the co-production of everyday and ordinary environments. One way to do this is to admit – as many scholars in the field of biosemiotics have done – that nature is made up of « signs, interpretations and meanings » (Wheeler 2014: 375) and to increase our knowledge of an aesthetic experience related to nature. We will deploy these issues on a theoretical level through the conceptual expression of environmental forms and the concept of immunity. Based on an interdisciplinary research, the related fieldwork includes a hundred non-directive interviews and observations conducted in several French cities (Paris, Rennes, Lyon), in specific neighborhoods such as the public housing district of Blosne in Rennes and the Croix-Rousse district in Lyon, or with specific associations to reflect the role of public institutions in the socio-natural arrangements of groups of inhabitants in the cities of France." (source éditeur)