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This is Scientific American 60-Second Earth. I'm David Biello. Your minute begins now.

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More than half of the world's 7 billion people live in cities, 54 percent to be specific, or 3.9 billion people.

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That's according to new figures released by the United Nations on July 10th.

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Cities in China, India and Nigeria, the world's first, second and seventh most populous countries, are expected to grow the most by 2050.

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India alone will add more than 400 million people to its cities, or the equivalent of 20 Mumbais, just in the next three decades.

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By 2030, New Delhi is likely to have 36 million residents.

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How these cities in Asia and elsewhere grow and get built will determine how humanity fares in the 21st century.

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Housing, energy and transportation are all major challenges,

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whether in sprawling megacities or relatively small towns of a million or so inhabitants.

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The health and environmental consequences of wasteful infrastructures could be devastating.

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Cities are now responsible for more than 70 percent of the greenhouse gases causing global warming,

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which has impacts on everything from growing food to water supplies.

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And most at risk from sea level rise are all those folks in coastal cities.

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The future is urban for better or worse.

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for Scientific American 60-Second Earth. I'm David Biello.

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