I have recently joined this site www.carbonrally.com and I am on the seventeen magazine team. This site provides facts about global warming and about how you can help stop it. There you can also take challenges to help the earth (such as not eating meat for two days). There is also great information about the challenges and just exactly what you are doing for the earth when participating. The site also calculates how much Co2 you have prevented from going into the earth. I urge you to check it out (and check out my sidebar too to find a carbon rally widget! ) and start saving the earth now!