It's Earth Day....and well, do something.
Here is an amazing site that will give you some inspiration. I actually surprised myself and did their Opt Out of Junk Mail suggestion and I can't tell you how much less crap shows up in my mailbox. You can also opt out of getting the Yellow Pages, which everytime I turn around shows up in all its combersome-ness at my doorstep. Ahhhh the trees are thanking you already!!
http://www.askwoollym.typepad.com/ (source image)