Help Stop Global Warming
You walk wherever you can, and take public transport when you can't walk. You turn the lights off when you leave a room, take short, cold showers, and recycle your trash. You buy sustainable forest products. But maybe you're thinking: Is there more I can personally do this holiday season, to cut the level of CO2 in the atmosphere?
As it happens, there is :)
http://www.newscientist.com/blog/environment/2006/12/carbon-sequestration-in-obese-humans.html