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In this short, serious, and well-written book, Sir Roy Calne joins the ranks of many others who have expressed their concern about the world population explosion. He endorses the conclusions of the world's national academies of science (which are included as an appendix in the book) that we must achieve zero population growth by the middle of the 21st century to maintain a stable global environment. He provides statistics that state the problem clearly. The global fertility rate is now 3.3 children per woman. Even if it declines to 2.1 over the next 50 years, the world's population is projected
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