Where do you live? What do you eat? What do you drive? If we measure all that in terms of biologically productive acres needed to support you, then you have a measure of your ecological footprint.
Unfortunately, that statistic doesn't mean much to most people - what does it mean to have an ecological footprint of ten, sixteen, or twenty-two, for example? Well, there is one clever way to drive home what it means. If you divide it by the number of biologically productive acres per person worldwide, you can find out how many planets we would need if everyone lived like you.
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