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When did the human population doubled from 2 billion to 4 billion?
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When did the human population doubled from 2 billion to 4 billion?
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Dec 25, 2019
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When did the human population doubled from 2 billion to 4 billion?
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1980 1980 1980 1980 1980
Tuan Huynh
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Dec 31, 2019
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Tuan Huynh
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