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In its infancy Montreal's bike-share program was hailed as one of the "best inventions of 2008" by Time. Called Bixi (short for "bike" and "taxi"), the system has so far failed to turn a profit. The city of Montreal bailed Bixi out last year to the tune of $108 million in debt payment and loan guarantees.

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.