Washington, DC claims crown of greenest U.S. city |

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With its installation of 1.2 million square feet of green roofs in 2014, Washington, DC can quite literally claim the crown of greenest U.S. city.

This is according to a new report from the nonprofit Green Roofs for Healthy Cities (GRHC), which has ranked the top ten North American metropolitan regions that have installed the most square footage of green roofs last year. Green roofs aren’t just good for the environment. A new study from the University of Melbourne found that observing nature for 40 seconds or more can markedly increase attention and productivity levels.

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