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Green roof gambit: How plant-covered rooftops will defend cities against global warming

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Gaffin's green roof in March 2008. The plants are just starting to grow out of the netting that secures them to the roof. The plants are sedum, a stocky succulent that can survive frigid winters and sweltering summers.

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Green roofs are a growing trend in building development, but can they do anything besides lower the energy bill? Climate scientists think green roofs have great potential to defend cities against the ravages of global warming, and, as the research pours in, the case for green roofs is growing.


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