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In 1932, the year of Paul Ehrlich’s birth, the population of the world was 2 billion. In 1968, when “The Population Bomb” – by Ehrlich and his wife, Anne – was published, there were 3.5 billion people in the world. Today, there are 7.5 billion, and by 2050 there will be 9 billion. Prof. Ehrlich was not the first to talk about the problem of population growth, but his book spawned a lively and still-ongoing...