Trees shade and cool:
Shade from trees reduces the need for air conditioning in summer. In winter, trees break the force of winter winds, lowering heating costs. Studies have shown that parts of cities without cooling shade from trees can literally be "heat islands," with temperatures as much as 12 degrees Fahrenheit higher than surrounding areas.
A Tree's Importance and Environmental Benefit
By Steve Nix, About.com Guide
Eight Reasons to Plant Trees | Trees Shade and Cool
Tree Shade
Steve Nix/About ForestryPrev
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