After some years of crisis and stagnation, the development of new ski resorts seems to be on the upswing in the French mountains. New districts, more and more futurist lift installations, articillay modified mountains to compete with other areas and satisfy the growing demand of the clientele attact the attention and protest of environmental protection associations, in the name of a sustainable tourist development. The example of the three valleys: Tarentaise, Maurienne, and the eastern side of the oyrenees.