Look Outside the U.S. for the World's Most Sustainable Cities

European cities were among the most sustainable; not a single U.S. or Canadian city cracked the Top 20

A road sweeper at work on the waterfront, in Singapore.

Photographer: Munshi Ahmed/Bloomberg

For all the conveniences that cities have to offer -- from shorter commutes to neighborhood farmers markets -- many are failing to meet the challenges of sustainable development.

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