Home
Ecological Footprint
One of the best things you can do for the environment is to measure your ecological footprint. It estimates how much land and water is necessary to compensate your impact, that is, what you use and discard.
The Concept
"The phrase "ecological footprint" is a metaphor used to depict the amount of land and water area a human population would hypothetically need to provide the resources required to support itself and to absorb its wastes, given prevailing technology. The term was first coined in 1992 by Canadian ecologist and professor at the University of British Columbia, William Rees." -- Read more at Wikipedia's page.
Calculator
The following is probably the best calculator online. Access it here.