Long before the phrase "energy crisis", the energy flows on earth were clearly distributed and well-dosed - until we humans got fire under control about 500 thousand years ago and began to actively use the energy flows of the earth for ourselves. We are now using so much energy that our planet is reaching its limits. Wouldn't it be clever to find an energy that protects the earth and the climate and is inexhaustible at the same time? But where do we find it, this perfect energy?