Human overpopulation
Overconsumption

The World Wide Fund for Nature (WWF) and Global Footprint Network have argued that the annual biocapacity of Earth has exceeded, as measured using the ecological footprint. In 2006, WWF's Living Planet Report stated that in order for all humans to live with the current consumption patterns of Europeans, we would be spending three times more than what the planet can renew. According to these calculations, humanity as a whole was using by 2006 40% more than what Earth can regenerate. Another study by the WWF in 2014 found that it would take the equivalent of 1.5 Earths of bio-capacity to meet humanity's current levels of consumption. However, Roger Martin of Population Matters states the view: "the poor want to get rich, and I want them to get rich," with a later addition, "of course we have to change consumption habits,... but we've also got to stabilize our numbers".

Critics have questioned the simplifications and statistical methods used in calculating ecological footprints. Therefore, Global Footprint Network and its partner organizations have engaged with national governments and international agencies to test the results—reviews have been produced by France, Germany, the European Commission, Switzerland, Luxembourg, Japan and the United Arab Emirates. Some point out that a more refined method of assessing Ecological Footprint is to designate sustainable versus non-sustainable categories of consumption.
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