According to Wikipedia, the ecological footprint is a measure of human demand on the Earth’s ecosystems. “It compares human demand with planet Earth’s ecological capacity to regenerate. It represents the amount of biologically productive land and sea area needed to regenerate the resources a human population consumes and to absorb and render harmless the corresponding waste.” The data is used to estimate how much of the Earth (or how many planet Earths) it would take to support humanity if everybody lived a given lifestyle.
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