The current problems of sub-Saharan peoples who are subject to recurrent famine and shortages of food are only one facet of a wider problem which confronts the peoples of the world. This problem, which is a vast in scale, concerns the relationship between the physical and biological resources which the world can muster and the provision of food for the adequate nutrition of its peoples. Overshadowing much of the thought about the future is the theorem propounded by Malthus almost 200 years ago, namely that population, unless checked in some way, has the capacity to outstrip the productivity...