Why do you suppose that the United Nations gives high, medium, and low projections for future population

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Why do you suppose that the United Nations gives high, medium, and low projections for future population growth? Why not give a single estimate? What factors would you consider in making these projections?
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Principles of environmental science inquiry and applications

ISBN: 978-1259656415

7th edition

Authors: William P. Cunningham, Mary Ann Cunningham

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