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During all but the most recent years of the centuries of his existence man must have lived, reproduced, and died as other animals do. His increase in number was governed by the three great regulators of the increase of all species of plants and animals — predators, disease, and starvation — or, in terms more applicable to human populations — war, pestilence, and famine. One of the most significant developments for the future of mankind during the first half of the 20th century has been his increasing ability to control pestilence and famine. Although he has not freed himself entirely from the force of these two regulators of population increase, he has gained sufficient control of them so that they no longer effectively govern his increase in number.
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