If there is today a significant scientific knowledge in the distinct fields of urban ecology and urban design, the effects of their meeting are increasingly invested in a resilient urbanism for the habitability of life. Faced with the climate emergency, the loss of biodiversity, the depletion of resources and the artificialization of land, MOBIUS proposes to respond to these issues by conducting new multidisciplinary analyses combining human and social sciences and natural sciences, bringing together researchers, students, public actors, architects-urban planners-landscape designers, biologists, ecologists to propose concrete courses of action for an urbanism of open environments, understood as all unbuilt spaces, whether public or private, vegetated or not. Gathered together in a guide plan for a network of fresh ecological paths on the scale of the city of Lausanne, these visions will then be applied to three major sites of urban change identified by Lausanne in the PDCom (Municipal Master Plan: Sebeillon Sévelin, Nord/Est Boveresses, Rives de Lac).