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It is explained that energy used wanted by mankind is only a small fraction of total energy radiated by the sun to earth, which small quantity is acculated in plants and in wood and their fossiles. Nevertheless the energy want has grown by recent increase into a threat of energy shortage in the near future. Burning of fossile material sets free some ev of energy and causes a new arrangement of the electrons, fission of the nuclei multiplies the energy by millions. The number of fassble nuclei can be increased by a factor of 100 when the breeding type of reactor is chosen. Both types of breeders, the thermal and the fast types are discussed. In arnhem a thermal breeder is erected, whereas the netherlands are collaborating in an project for a fast breeder inkalkar. (X, 20.12.73)