Nowadays, energy is a severe problem for the mankind, not only because of the population explosion but also because human beings are calling for less poverty and better life. Fossil energies are limited and pose severe problems. New forms of energy can be expected from solar energy and from non-proliferating nuclear energy in various forms (Thorium cycle fission, nuclear fusion). Developed countries are urged to largely invest in the development of these new forms of energy, as this is their duty for the whole mankind.