An individual’s or country’s ecological footprint is determined by two main factors: 1. The amount of biological material they use, and 2. the amount of carbon dioxide they produce. From the amount of biological material they use, the amount of land required to produce that biological material is calculated, based on the productivity of the land that the material came from. To this is added the amount of land required to absorb the carbon they produce. The sum of these two amounts equals the individual’s or country’s ecological footprint.
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