World's fastest-growing cities

By 2050 most of the world will live in cities, a shift that will influence culture, investment, and policy. Here are the top spots for projected growth.

3. Sanaa, Yemen

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    People walk in Souq al-Melh market place at the Old Sanaa city December 14.
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This capital city of 2 million people stands to grow by 5 percent a year. Power struggles continue as part of the 2011 Arab Spring protests.

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