"The future of mankind is going to be decided within the next two generations, and there are two absolute requisites: We must aim at a stable-state society [with limited population growth] and the destruction of nuclear stockpiles. ... Otherwise I don't see how we can survive much later than 2050."
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Source : "French Nobel Biologist Says World Based On Chance". "The New York Times", (p. 6), www.nytimes.com. March 15, 1971.