[M3Bahn]

As the world population explodes, so does the growth of cities, especially in Asia and Africa.
Globally, one in two people lives in an urban area, a milestone reached in 2007, says the United Nations Population Fund, the agency that predicts world population will reach 7 billion on Oct. 31.
In about 35 years, two out of three people will live in cities and towns, the agency predicts.

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