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. "4 How and Where Will 10 Billion People Live on Earth?." Understanding the Changing Planet: Strategic Directions for the Geographical Sciences. Washington, DC: The National Academies Press, 2010.
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FIGURE 4.1 Depending on fertility and mortality rates, total world population could reach nearly 12 billion by 2050, but could be as low as 7.9 billion. SOURCE: United Nations.
FIGURE 4.2 Percentage of urban population by region, 1950-2050. SOURCE: United Nations.