“There is presumably an upper limit to the carrying capacity of humans on earth—of the numbers that agriculture can support—and that number is usually estimated at between 13-15 billion, though some people think the ultimate numbers might be much higher.”

— Niles Eldredge

2001
"The Sixth Extinction" http://www.actionbioscience.org/newfrontiers/eldredge2.html, an ActionBioscience.org original article

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American biologist 1943

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