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Wuhan, China
Wuhan, China
If government releases are to be believed, Wuhan takes the cake for the world's largest bikeshare system, with a whopping 70,000 (and more on the way).

This story is from the July 23, 2012 issue of Fortune.
By Anne VanderMey, reporter @FortuneMagazine - Last updated July 19 2012: 8:49 AM ET
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Google's zero-carbon quest

The search giant has an ambitious plan to achieve its goal: becoming the world's most energy-efficient company.