According to this awesome site, http://www.ecofoot.org/, if everybody lived like me we'd need more than 5 planets to sustain our lives. After you take their quiz, it will generate a picture of your life followed by statistics of how much land, food, water, etc you consume. Click on mine to see how selfish I am...but seriously it has action items and ways to reduce your carbon footprint, more than anything it is a resource rich website and a good kick in the pants (are only guys supposed to use that?).