Will the world's energy resources suffice to secure the world economy's supply in the face of the continuing growth of the world population. This question is answered. The development of the world population shows patterns which make possible an estimation of the future populations of industrial and developing countries. The rise of the primary energy carriers is described. An analysis of the reserves and resources concludes that, if energy policies remain unchanged, reserves will be exhausted by the middle of the next century. In this connection, the introduction of atomic energy according to present plans and the possibilities of energy sources which may be re-generated are considered. The availability of liquid energy carriers based on petroleum will probably become a decisive bottleneck for the world's energy supply before the end of this century. The danger of coming to an energy disaster in our life-time can be averted. Possibilities for securing the energy supply in the future are proposed. In this connection, the positive effects on unemployment are spelled out. The idea of 'World Energy Management' is discussed.