Where are the best places for the next billion people? Think globally, plan regionally

The United Nations recently projected that the world population will increase to 9.6 billion in 2050 and 10.9 billion in 2100, with a continuing upward trend (Figure 19.1) (Gerland et al., 2014; but see Lutz et al., 2008). This new forecast overturns the widely accepted projection in the literature during the past 20 years that the global population will stabilize at about 9 billion by the end of this century (e.g., Lutz et al., 2008). The world population increased from 6 billion in 1999 to 7 billion in 2012,

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