Hydrogen can be produced in the subsoil, by ... the Earth! As many scientists have shown, this natural hydrogen, known as "white hydrogen", is not only abundant but also not expensive to extract. Apparently, it can no longer be considered as an energy vehicle, but as a real source of energy. After the green wave, a white wave? What is it exactly? It is an exciting assumption, yet to be confirmed... Its potential is difficult to assess, but it could be a game-changer in the energy world.