Thousands of trucks haul coal 24 hours a day from the mines outside Baotou, Inner Mongolia. In China, more than 1 billion metric tons of coal a year is shipped by truck. Photo copyright Toby Smith, Reportage by Getty Images

Thousands of trucks haul coal 24 hours a day from the mines outside Baotou, Inner Mongolia. In China, more than 1 billion metric tons of coal a year is shipped by truck. Photo copyright Toby Smith, Reportage by Getty Images

Thousands of trucks haul coal 24 hours a day from the mines outside Baotou, Inner Mongolia. In China, more than 1 billion metric tons of coal a year is shipped by truck. Photo copyright Toby Smith, Reportage by Getty Images

Thousands of trucks haul coal 24 hours a day from the mines outside Baotou, Inner Mongolia. In China, more than 1 billion metric tons of coal a year is shipped by truck. Photo copyright Toby Smith, Reportage by Getty Images

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