According to J. Kenneth Smail, the optimum maximum sustainablehuman population is: A. 1-3 billion. B. 4-6 billion. C. 7-10 billion. D. 20 billion.

According to J. Kenneth Smail, the optimum maximum sustainablehuman population is: A. 1-3 billion. B. 4-6 billion. C. 7-10 billion. D. 20 billion.

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