China is building twenty new cities a year and has been, for two decades. But the massive urbanization is taking its toll on China's environment - and on many of its people who have been pouring into the mega-cities from China's countryside. The United States went through a similar transformation in the 19th century. But in China, it's happening faster and on a much larger scale. It's a massive migration which shows no signs of stopping as Mary Kay Magistad reports in her six-part series.
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