21 Oct '11, 9pm

White Roofs Not Good for Climate, Increase Global Warming (Shocker!)

White Roofs Not Good for Climate, Increase Global Warming (Shocker!)

Jacobson’s computer modeling concluded that white roofs did indeed cool urban surfaces. However, they caused a net global warming, largely because they reduced cloudiness slightly by increasing the stability of the air, thereby reducing the vertical transport of moisture and energy to clouds. In Jacobson’s modeling, the reduction in cloudiness allowed more sunlight to reach the surface. The increased sunlight reflected back into the atmosphere by white roofs in turn increased absorption of light by dark pollutants such as black carbon, which further increased heating of the atmosphere.

Full article: http://cleantechnica.com/2011/10/21/white-roofs-not-good-...

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