The COP 21 international meeting has set the maximum temperature rise of the atmosphere to be 2 °C for the year 2100. To reach this ambitious goal there is only one way: to stop the consumption of fossil fuels, coal, oil, natural gas. Their use as energy sources releases more than 30 billion metric tons of CO2 per year, contributing 26% to the greenhouse effect that warms the atmosphere. As a solution let's transform the CO2 of the atmosphere into fuels necessary for the smooth running of our societies! By reacting the gas with water we know how to make all the necessary fuels: kerosene, gasoline, diesel, needed for transport. This requires clean energy sources that do not emit CO2. Renewable energies will of course be at the forefront, but their insufficiency and intermittency will require the implementation of new sources of nuclear energy, the only truly ecological sources of energy. éditeur