Telling people to plant a tree in order to make a difference sounds a little bit cliché. But that doesn't make it any less true. Planting a tree this weekend will not only help you to celebrate Arbor Day in style, but it will also improve our air quality, offer some wildlife a place to hang out and allow our world to be just a bit greener. So get outside, get your hands dirty and get to digging. One more tree may seem like only that, but it will also mean a lifetime of great benefits to Mother Earth.