What forms of energy will humanity call upon to meet the needs of 9 billion people in a few decades? To all of them, answer the experts today. Renewable as well as the most classic. “Faced with the problem of energy and climate, time does not exclude one energy system from another. Everything is good to take. Without prejudice or angelism ”, insists Philippe Pradel, director of nuclear energy at the Atomic Energy Commission (CEA), who recalls that“ by 2050, world energy consumption should double ”to reach 20 Gtep (billion tonnes of oil equivalent).