The decision to make giving birth dependent up on the economic situation undermines the very thing which enables man to adapt Nature to his needs. The idea of overpopulation and its relativity is examined. Consideration is given to how to meet present and future shortages which cause people to think in terms of overpopulation. It is suggested that the bottleneck is human energy. Sociological and psychological evidence which shows which factors influence the amount of available human energy are discussed, for available human energy can enable humanity to turn the technical possibilities into reality.
