Green roofs on the rise in urban areas.(ecotalk)

Construction of green roofs grew 30 percent in North America last year, according to the third annual Green Roof Market Industry Survey. Due to their cost, they appear primarily on public and commercial buildings, such as the Bank of America tower in Manhattan. But more are sprouting on the rooftops of private dwellings. The survey, conducted by the Toronto-based nonprofit group Green Roofs for Healthy Cities, reports that for the third time, Chicago topped the list of U.S. and Canadian cities for square footage of green roofs installed in one year. Only members of the Green Roofs for Healthy Cities are polled, but the group estimates the results reflect approximately 60 percent of green roof activities in the United States and Canada.

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