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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 .It's Lunar New Year, the "year of the horse."
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3 .Of course, horse is not how millions of Chinese are currently traveling, as they return home from the growing cities where they are trying to better their lives.
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4 .Within the last five years, China has built a network of high-speed rail that covers most of the main routes between cities.
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5 .But that's not how most Chinese people are getting home, it's too expensive.
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6 .Cheaper, slower, dirtier trains are more popular, but don't go everywhere people want to be.
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7 .No, buses carry the bulk of the travelers back home and will return them to the cities when the holiday season ends.
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8 .But buses are not the only vehicle plying the ever more crowded roads.
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9 .With increased wealth has come a growing love affair with the car.
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10 .China is now home to 120 million private cars, up from just 15 million at the turn of the century.
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11 .That's bad news for air quality.
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12 .As one city environmental official told me when I recently visited, no matter how much he curbs pollution from industry, smog continues to suffocate because of more and more cars.
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13 .Should China eventually approach the number of cars per capita in the U.S., they'd see more than a billion vehicles on their roads.
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14 .The smog may stop them from seeing much else.
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15 .Your minute is up, for Scientific American 60-Second Earth. I'm David Biello.
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