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Photo of a white rooftop

How effective are white roofs in cities? Scientists are finding new and surprising answers.

Credit: lbl.gov

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graphic illustration showing variation of temperature in urban landscape

Cities produce what's known as the urban heat island effect: It's significantly warmer there.

Credit: U.S. EPA

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Photo of a roof with plants growing and a wind turbine in the background

Researchers have found an important seasonal contrast in cooling by green roofs and white roofs.

Credit: U.S. EPA

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Aerial view of Queens, N.Y. showing different kind of roofs

White roofs dot an aerial view of Queens, N.Y.

Credit: NASA

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Painters working on a Washington, D.C., roof to make it a light-reflecting white.

Painters work to turn a Washington, D.C., roof a light-reflecting white.

Credit: AGU

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