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Top 10 green U.S. cities

oakland skyline

Photo: Harbor Association

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4. Oakland, Calif.

Residents of this port city have access to an abundance of fresh, organic food, much of which is locally sourced. It's also home to the nation's cleanest tap water, hydrogen-powered public transit and the country's oldest wildlife refuge. Oakland also plans to have zero waste and be oil-independent by 2020, and already gets 17 percent of its energy from renewable sources.