Earth Overshoot Day is computed by dividing the planet’s biocapacity (the amount of ecological resources Earth is able to generate that year) by humanity’s Ecological Footprint (humanity’s demand for that year). This ratio is multiplied by 365 to get the date when Earth Overshoot Day is reached. To calculate your own Earth Overshoot Day and Ecological Footprint, visit: www.footprintcalculator.org
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An Optimist's Guide to Solving Climate Change and Saving the World