Green Roofs Slow To Take Root

"The problem of urban water runoff has worsened as buildings, parking lots, streets and sidewalks have replaced open space...green roofs can provide insulation, absorb storm water and outlast conventional roofs while making a building more energy-efficient. Besides storm water, green roofs may help reduce the so-called urban heat island effect, which develops when dark rooftops and pavements absorb the sun's heat and radiate it."

Thanks to Abhijeet Chavan