A growing trend, green roofs consist of a thin layer of plants covering roofs of buildings are designed to reduce air pollution, control heating and cooling costs, and absorb storm...

A growing trend, green roofs consist of a thin layer of plants covering roofs of buildings are "designed to reduce air pollution, control heating and cooling costs, and absorb storm runoff". Also from the International Herald Tribune:

The carefully selected plants and soil – engineered to weigh a fifth as much as typical dirt – help clean the air and absorb rain that would otherwise become runoff. When many of them are clustered together, green roofs can reduce the urban heat effect. Densely populated cities tend to be hotter than surrounding areas because of the heat-trapping properties of tall buildings, asphalt and concrete.

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