[en] This report of the French National Assembly first outlines and comments the need for a commitment to preserve the planet, which encompasses the struggle against climate change within the frame of the several existing international agreements. The author then stresses the fact that the French commitments must be met, and that the French national policy must be a model in order France to have a bigger weight in international conferences, particularly in the field of greenhouse gas emission reduction. Then, after having recalled the historical background of planning practices in France, and described the various planning instruments ('contrats de Plan Etat-Regions') and institutions (DIACT, previously named DATAR), the author presents an example of ecological land planning: the 'Schema Directeur 2008 de la Region Ile-de-France' (Ile-de-France regional guiding plan for 2008), which defines the future of the Ile-de-France region by 2030 in terms of space planning as well as in terms of social, economical and environmental evolutions. The report then discusses the various aspects of an ecological planning: an environment-friendly energy, an efficient housing policy which is in relationship with transport networks, an economy taking the ecological factor into account. A transcription of the debate of the Commission is given