| Factfulness: Ten Reasons We're Wrong About the World — and Why Things Are Better Than You Think | In short, if the long-term carrying capacity of an area is clearly being degraded by its current human occupants, that area is overpopulated |
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| Universidad del Externado de Colombia | Revista de El Colegio de San Luis |
| International Energy Outlook 2000, Energy Information Administration, Office of Integrated Analysis and Forecasting, , Washington, D | "The climate mitigation gap: education and government recommendations miss the most effective individual actions" |
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| Sample, Ian 31 August 2007 | When is an area overpopulated? |