Green Roofs are Starting To Sprout in American Cities by Bruce Stutz

Long a proven technology in Europe, green roofs are becoming increasingly common in U.S. cities, with major initiatives in Chicago, Portland, and Washington, D.C. While initially more expensive than standard coverings, green roofs offer some major environmental — and economic — benefits. via Green Roofs are Starting To Sprout in American Cities by Bruce Stutz: Yale Environment 360.