http://www.earthday.net/Footprint/info.asp
If everyone lived the way I do, it would take 9.3 earths to shoehorn us all in. To be fair, though, much of my lifestyle is dictated by my job, which puts me in the house I live in and has me running around burning up gas like crazy. I'd actually be happy with less house and less running around, but it's hard to phone in the pastor gig from a remote location.