We were delighted by the clear consensus that emerged at the end of the Iceland conference, that population size and growth is one of the major factors in assessing the sustainability of economies and societies, which should be taken into account. As an aid to doing so, we attach the current Overshoot Index. This is a simple extrapolation for population size from the data of the (Kenneth Boulding Award-winning) Global Footprint Network. No-one, of course, claims that the figures are precise. Indeed, by omitting non-renewables and biodiversity, they may overstate sustainable populations. But as a rough guide to orders of magnitude, not least of the scale of the overshoot problem, we believe they could be of use to ISEE members.
Signed: Blake Alcott; Carter Dillard; Sigrun Maria Kristinsdottir; Karin Limburg; Roger Martin; Luke O’Brien; Maria Ibbarola Rivas.
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