A new 20-year sustainable-development plan for Washington, D.C., focuses on energy efficiency, increased mass transit and bicycle lanes, more tree cover, green roofs and more. "The goal is to have D.C. be visionary in as many areas as possible and, when you add it all up, for D.C. to be the greenest, healthiest, most livable city in the U.S.," said Christophe Tulou, head of the D.C. Department of the Environment.

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