City trees can offset neighborhood heat islands, finds a new study, which shows that enough canopy cover can dramatically reduce urban temperatures, enough to make a significant difference even within a few city blocks. To get the most cooling, you have to have about 40 percent canopy cover.

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City trees can offset neighborhood heat islands, finds a new study, which shows that enough canopy cover can dramatically reduce urban temperatures, enough to make a significant difference even within a few city blocks. To get the most cooling, you have to have about 40 percent canopy cover.