http://www.footprintnetwork.org/en/index.php/GFN/page/calculators/
What is the Ecological Footprint?
The Ecological Footprint is a resource accounting tool that measures how much biologically productive land and sea is used by a given population or activity, and compares this to how much land and sea is available. Productive land and sea areas support human demands for food, fiber, timber, energy, and space for infrastructure. These areas also absorb the waste products from the human economy. The Ecological Footprint measures the sum of these areas, wherever they physically occur on the planet. The Ecological Footprint is used widely as a management and communication tool by governments, businesses, educational institutions, and non-governmental organizations.
Personal footprint: http://www.footprintnetwork.org/en/index.php/GFN/page/personal_footprint/
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