They found that a city with only white rooftops could reduce the urban heat effect by thirty-three percent.

VOA: special.2010.03.02

He says the study shows that, in theory,white roofs could be effective in reducing urban heat.

VOA: special.2010.03.02

Mister Chu said sunlight,and its heat, will bounce off a white colored roof.

VOA: special.2009.06.19