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In discussing environmental issues "footprint" is the impact you have on the world or the ecosystem.
The calculation of footprint is generally very poorly done due to the complexity of the impacts involved, both gives and takes. As an example "carbon footprint" is generally considered to be the amount of greenhouse gases equivalent expressed as carbon dioxide that an individual releases - this could include direct fuel consumption, power consumed to manufacture household goods, methane released from cattle used in food production, reduction in carbon sinks through forestry products consumption and so on on the impact side and the impacts of recycling, reduced fuel consumption and Birth Control on the positive sde.
There are several non-renewable resources that cpuld be treated in the same way - you could have a "Petroleum footprint" or a "Helium footprint" as well.

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