“One World, One Dream,” is the official motto of the Beijing Olympics that open Friday, but the world has become considerably more complicated since the International Olympic Committee awarded the 2008 Summer Games to China seven years ago.
That was long before China’s crackdown on Tibet this spring, before its support for the government of Sudan became an international issue and before air pollution became so threatening that the Ethiopian world-record holder in the marathon thought it better to run a shorter distance to protect his lungs.
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