Abstract
In the spring of 2007, someone moved to a city. The move was a momentous one in terms of its demographic implications—it marked the tipping point of a new urban century in which more than half the world's population now lives in cities.
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In the spring of 2007, someone moved to a city. The move was a momentous one in terms of its demographic implications—it marked the tipping point of a new urban century in which more than half the world's population now lives in cities.