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For Roofs, White Is the New Cool

Officials at the US Department of Energy are checking their roofs for some of that “low hanging fruit” available to increase energy efficiency in buildings. A study released this week by Lawrence Berkeley National Laboratory suggests that “cool roofs” have the potential to offset up to two years worth of worldwide CO2 emissions and reduce the effects of urban “heat islands.” If that’s the case, increasing the albedo, or reflectivity, of roofs and pavements might be the solution to hotter days in the city.

Flying over most California cities reveals relatively few white roofs (Photo: Craig Miller)

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