[en] This report proposes a prospective vision of the ways of life of French household by 2030 and 2050, these ways of life being in compliance with scenarios presented by the ADEME within the frame of the national debate on energy transition which notably aims at dividing by four greenhouse gas emissions in France by 2050. Eight types of households are defined (couple with two children, mother alone with a child, elderly retired, rather young retired, father with two children in alternating custody, couple with three children) with different revenue levels (from modest to better off) and different living locations (medium city, suburban, urban, rural, city centre). Lifestyles or scenarios of life are rather precisely defined for these different households and their members. The objective is to compare energy profiles and greenhouse emissions, the impact of lifestyles on the level of direct and indirect consumptions and on the different types of used energies, to control the global result with aggregates. Consumptions are assessed for different aspects of life: food, appliances, housing, and mobility. These assessments are made for 2030 and for 2050