Just a link really, I haven’t played around with it much:
“Brighter Planet helps you take control of your environmental footprint — you’ll measure your climate impact, discover simple ways to reduce it, track your progress, and share your experiences. No politics, no arguments. Just real people, real actions — all making a real difference.” -Brighter Planet:
Developed by one of the leading design companies around (ourselves a close second, to be sure): Happy Cog (they also have a great name).