MINNEAPOLIS / ST. PAUL -- Human population growth has turned "a very sharp corner" and is now slowing, on its way to leveling off in the next century, according to a study by University of Minnesota ecologist Clarence Lehman. He used new equations that take into account the accelerating effect population density has on per capita population growth at certain points in history--what is termed "positive feedback." The new equations show that the long-increasing human population growth rate began an abrupt decline in the 1970s, and these equations agree with recent work by demographers, Lehman said. He presented his work Monday, Aug. 6, at the Ecological Society of America meeting in Madison, Wis.
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