Warming world may put most cities off-limits for summer Olympics

Health and safety of Olympians has been an ongoing story at Summer Olympic games. In 2008, air quality raised concerns in Beijing, while 2016 has been dogged with questions about polluted water and the Zika virus. Now, a new commentary co-written by UC Berkeley professors Kirk Smith and John Balmes, and others, says the future of the summer Olympics may be in jeopardy for another reason: heat.

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