Preservation of biodiversity requieres not only acting on nature, but also on human environment. This action calls for an ethics of our common membership, to rekindle the conscienceness of our responsability toward the future of the planet, by reviving the feeling of its fragility. This approach inspired by a dialog between Paul Ricoeur and Hans Jonas about the conservation ethic leads us to rely on the dynamics of feelings, previously to the one of concepts and principles. On the one hand, we belong to nature, through our body. On the other hand, human beings have a specific responsability toward the ecosystem, due to our unique conscienceness. Acting to preserve biodiversity needs a pedagogical approach focused on values linked to receptiveness. By reviving the conscienceness of our fragile condition, that would help resist predation logics, by including into minds as well as into social relationships a feeling of gratitude for what we owe to nature and to society, which is currently threatened.