"In 1956 Professor W.A. Lewis calculated that if the world population were to double every 25 years (a rate of increase currently observable in some parts of Africa and Asia), it would reach 173,500 thousand million by the year 2330, 'at which time there would be standing room only, since this is the number of square yards on the surface of the earth'."
-from "The Faber Book of Science" edited by John Carey
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