Ecological footprint (EF) is a way of measuring demand on the Earth's ecosystems and natural resources. It refers to a number of different methods of analysis which give differing results, and is also used less strictly - to "reduce your footprint" doesn't automatically imply you have done an analysis.
Indeed, the analysis is only useful if it leads to results, and so taking steps toward a greener lifestyle are what matters most.
 See also
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