China has been building like crazy. Parallel to rapid, gargantuan urbanization -- 300 million Chinese people moved to the city from the country in the past 2 decades -- land development and construction has boomed. As Vaclav Smil has noted, from 2011 to 2013, 6.6 billion tons of concrete were used in China -- that’s about 2 billion tons more than were used in the United States over the entire 20th century. But as it turns out, even in China, 6.6 billion...
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