Credit: Natalie Behring/Reuters

A visitor arriving in Shanghai immediately notices China's technological conundrum. Through the windows of the magnetically levitated train that covers the 30 kilometers from Pudong International Airport to Shanghai at up to 430 kilometers per hour, both the progress the country is making and the price it is paying for it are apparent. Most days, a yellow haze hangs over Shanghai's construction frenzy. Pollution is the leading cause of death in China, killing more than a million people a year. And the primary cause of pollution is also the source of the energy propelling the ultramodern train: coal.

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