New environmental and ecological considerations lead the city players to redefine their primary values. New districts aim at offering more sustainable urban patterns while the others are progressively rebuilding themselves in a more environmentally friendly way. Water, flows and waste management strike as the more obvious stakes, but the methods of management, of control and moreover of sharing have a part too in the reflection that goes with those major urban mutations. It is a matter of giving rise to non anthropocentric environments, where water and wildlife could have some space. Environments that would care about living environment, ecology, well-being and sharing.