The date of Earth Overshoot Day is calculated by comparing humanity’s total yearly consumption (Ecological Footprint) with Earth’s capacity to regenerate renewable natural resources in that year (biocapacity).  The Global Ecological Footprint and biocapacity metrics, in turn, are calculated each year with National Footprint Accounts. Using UN statistics. The overall trend shows that in 1970 we made it to December 29th, in 1978 to November 7th, in 1988 to October 15, 1998 to September 30th and in 2008 to August 15th. This means to satisfy our current global consumption pattern we now need 1.7 planets – does anyone have a spare?


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