First published in 1987, this book is about the challenge posed by the unprecedented growth of the world's population and the response that has been made to that challenge by the United Nations and its system of agencies. It focuses in particular on the creation, in 1969, of the United Nations Fund for Population Activities (UNFPA) as the principal instrument for the United Nations' population programmes and on the work undertaken by the United Nations and its specialized agencies, including the World Bank, in this field. A substantial part of the book is devoted to discussing the actual achievements, in terms of demographic policies and falling birth rates, which have been realised in different parts of the developing world. At a time when there is a good deal of criticism of the United Nations and its agencies, this book makes it clear that here at least is one area where the world organization is continuing to make an important contribution towards the solution of the most important problem of our time.