Another Ecological Footprint Calculator
Earthday's Ecological Footprint Quiz estimates how much productive land and water you need to support what you use and what you discard. After answering 15 questions you can compare your Ecological Footprint to what other people use and to what is available on this planet.
[According to the survey results, if everyone lived like this Planetizen editor, we would need four planets to sustain ourselves.]
Thanks to Congress on New Urbanism