20th Century - Developments in Brief - World Population

World Population

World population increased from about 1.6 billion people in 1901 to 6.1 billion at the century's end. Some believe that a significant driver of many of the problems of the 20th century was overpopulation. Overpopulation has been a fascination of many, including economic theorist Reverend Thomas Robert Malthus whose "An Essay on the Principal of Population" was first published in 1798. Some demographers have predicted that the population will reach a plateau of 9 to 10 billion around 2100.

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