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1 .This is Scientific American 60-Second Earth. I'm David Biello. Your minute begins now.
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2 .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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3 .That's according to new figures released by the United Nations on July 10th.
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4 .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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5 .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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6 .By 2030, New Delhi is likely to have 36 million residents.
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7 .How these cities in Asia and elsewhere grow and get built will determine how humanity fares in the 21st century.
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8 .Housing, energy and transportation are all major challenges,
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9 .whether in sprawling megacities or relatively small towns of a million or so inhabitants.
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10 .The health and environmental consequences of wasteful infrastructures could be devastating.
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11 .Cities are now responsible for more than 70 percent of the greenhouse gases causing global warming,
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12 .which has impacts on everything from growing food to water supplies.
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13 .And most at risk from sea level rise are all those folks in coastal cities.
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14 .The future is urban for better or worse.
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15 .for Scientific American 60-Second Earth. I'm David Biello.
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