Ecological Footprint
Description
"The ecological footprint (EF) was developed at the University of British Columbia by Dr. William Rees and Dr. MathisWackernagel. It estimates how much of Earth's productive land and sea is used to produce the food, materials and energy that we consume and to assimilate our wastes. The EF looks behind the scenes to see what it takes to make an alarm clock, a cup of coffee, clothes, a home or to operate an automobile. This gets complicated in our global economy where the products originate from around the world." (http://radicalsimplicity.org/footprint.html)