ifootprint.com
iFootprint :: Calculate Your Carbon Footprint and Reduce Your ImpactiFootprint.com calculates your carbon footprint based on your emissions produced from your home, garbage, recycling, driving, air travel, as well as eating habits. iFootprint.com provides an estimate of your direct contribution to global warming and climate change, and offers tips on how to immediately reduce your impact.
http://www.ifootprint.com/