"So shooting for one planet just means you would be totally dominant, and leave no space for other species. Ecologists say to maintain 85% of preindustrial biodiversity, it would take about at least half the planet left on its own. That would mean getting to half-planet. And now we use at least 1.75. I say at least because our assessments with about 15,000 data points per country in a year are based on UN statistics, and their demand side is probably an underestimate because not all demands are included. And also on the supply side or the regeneration side, the UN is very production oriented, so it's the FAO numbers, for example, look at agricultural production, and the depletion side or the destruction side is not factored in adequately.

So that's why it's an underestimate. And still, it shows we use about 1.75 Earths, and that's more than three times half an Earth. So that's kind of the difference. But we also know overshoot will end one way or another. The question is do we choose to end it? Do we choose it by design, or do we let nature take the lead and end overshoot by disaster? So it's really ending overshoot by design or disaster. That's the big choice we need to make.”

Mathis Wackernagel is Co-founder and President of Global Footprint Network. He created the Ecological Footprint with Professor William Rees at the University of British Columbia as part of his Ph.D. in community and regional planning. Mathis also earned a mechanical engineering degree from the Swiss Federal Institute of Technology. Mathis has worked on sustainability with governments, corporations and international NGOs on six continents and has lectured at more than 100 universities. Mathis has authored and contributed to more than 100 peer-reviewed papers, numerous articles, reports and various books on sustainability that focus on embracing resource limits and developing metrics for sustainability. Mathis’ awards include the 2018 World Sustainability Award, the 2015 IAIA Global Environment Award, being a 2014 ISSP Sustainability Hall of Fame Inductee, the 2013 Prix Nature Swisscanto, 2012 Blue Planet Prize, 2012 Binding Prize for Nature Conservation, the 2012 Kenneth E. Boulding Memorial Award of the International Society for Ecological Economics, the 2011 Zayed International Prize for the Environment (jointly awarded with UNEP). He was also selected as number 19 on the en(rich) list identifying the 100 top inspirational individuals whose contributions enrich paths to sustainable futures.

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