April 22, 2010 1:33 PM

Once-smoggy Mexico City makes a bet on bicycles

Once the smoggiest city on the planet, Mexico City has cleaned itself up and is coaxing residents to commute on bicycles. Taking cues from European cities in the vanguard of the green movement, such as Copenhagen, Paris and Barcelona, Mexico City has set up an urban bike-sharing system, moving faster and with greater ambition than most U.S. metropolises have.

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