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Tokyo
Tokyo
Though Tokyo does not yet have a formal citywide bike-sharing program, private bike rental companies make up some of the difference. The membership-based Cogicogi network offers the first half-hour free.


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.