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Washington D.C.
Washington D.C.
Launched in 2010, there are now more than 1,500 bikes in D.C.'s rapidly expanding Capital Bikeshare program. Starting at $7 a day, or $75 a year, Capital Bikeshare's 18,000 members report increased bike use and lower transportation costs.

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.