They teach us, and we tend them. Communities with trees can be as much as 12 degrees cooler in the summer than those without the protection trees provide. In winter, trees slow cold winds and reduce heating costs. Being able to see trees outside a hospital window has been shown to help patients heal faster. A view of trees can also reduce stress in the work place.
Trees help discourage vandalism, graffiti, and violence.
You can support Tree City USA wherever you live. Then choose your state. If your town is already a Tree City USA, ask your tree board or city forester how you can help. If your town is not a Tree City USA, the Arbor Day Foundation can send you information on how to become one. Trees help draw neighborhoods together.