1.) Go vegetarian - even if only just for today.
2.) Become a member of the Arbor Day Foundation, receive ten trees, and plant 'em!
3.) Support emissions reduction initiatives with a donation to offset your carbon footprint.
4.) Help an endangered species. Two of my faves: AmphibianArk.org and WWF Adoption/Gift Center.
5.) And an oldie but goodie: If you see a piece of litter, pick it up.
Visit the Arbor Day Foundation to help offset your lifestyle by clicking the logo above.