'Marketplace' Report: Urban Dwellers

According to a report released by the United Nations Wednesday, more than 3 billion people — more than half of humanity — will be living in cities by next year. By 2030, 5 billion people will call cities home. The projections have profound implications for economies and the environment.

Amy Scott of Marketplace talks with Madeleine Brand about the urban surge and how cities plan to handle the growth.

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