Optimum Supportable Global Population: Water Accounting and Dietary Considerations
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In this paper we develop a novel, comprehensive method for estimating the global human carrying capacity in reference to food production factors and levels of food consumption. Other important interrelated dimensions of carrying capacity such as energy, non-renewable resources, and ecology are not considered here and offer opportunities for future work. Use of grain production (rain-fed/irrigated), animal product production (grazing/factory farm), diet pattern (grain/animal products), and a novel water accounting method (demand/supply) based on actual water consumption and not on withdrawal, help resolve uncertainties to find better estimates. Current Western European food consumption is used as a goal for the entire world. Then the carrying capacity lies in the range of 4.5–4.7 billion but requiring agricultural water use increase by 450–530% to 4725–5480 km3, the range based on different estimates of available water. The cost of trapping and conveying such water, will run 4.5–13.5 trillion over 50 years requiring an annual spending increase of 150–400%, straining the developing world where most of the population increase is expected. We reconfirm estimates in the literature using a dynamic model. ‘Corner scenarios’ with extreme optimistic assumptions were analyzed using the reasoning support software system GLOBESIGHT. With a hypothetical scenario with a mainly vegetarian diet (grazing only with 5% animal product), the carrying capacity can be as high as 14 billion. Ecological deterioration that surely accompanies such a population increase would negatively impact sustainable population. Using our approach the impact of ecological damage could be studied. Inter- and intra-regional inequities are other considerations that need to be studied.
Keywordscarrying capacity estimates food production and consumption scenario analysis water use accounting
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- Bos, E., Vu, M.T., Massiah, E. and Bulatao, R.A.: 1995, ‘World Bank World Population Projections: 1994–1995’, Johns Hopkins Press.Google Scholar
- Brown, L.: 1995, ‘Who Will Feed China?: Wake-Up Call for a Small Planet (The Worldwatch Environmental Alert)’, W.W. Norton & Company.Google Scholar
- Brown, L.R., Kane, H. 1994Full House: Reassessing the Earth’s Population Carrying CapacityW.W. Norton & CompanyNew YorkGoogle Scholar
- Chen, R.S. 1990Refugees and HungerAlan Shawn Feinstein World Hunger ProgramProvidence, Rhode IslandGoogle Scholar
- Cohen, J.E.: 1995, ‘How Many People Can the Earth Support?’, W.W. Norton & Company.Google Scholar
- Crocker, D.A.Linden, T. eds. 1998Ethics of Consumption: The Good Life, Justice, and Global StewardshipRowman & Littlefield, Lanham, MD585Google Scholar
- FAO: 2004, Technical Document 2015–2030, http://www.fao.org
- FAOSTAT (Food and Agricultural Statistical Database), http://www.fao.org, accessed 1/15/02.
- Hjorth, L.S., Eichler, B.A., Khan, A.S. and Morello, J.A.: 2000, ‘Technology and Society: A Bridge to the 21st Century’, Prentice Hall, 537p.Google Scholar
- Islam, N.: 1995, Toward 2020: Conclusions from a Roundtable on Food and Population to 2010, 2020 VISION Synthesis, February 1995 (also available on http://www.ifpri.org/2020/synth/islam.htm- accessed April 4, 2005).
- IWMI (International Water Management Institute) 2000, World Water Supply and Demand 1995 to 2025, Colombo, Sri LankaGoogle Scholar
- Laherrer, J.H.: 1999, World oil supply what goes up must come down, but when will it peak? Oil and Gas Journal (February 1) 57–64.Google Scholar
- McLaughlin, L. 1993A case study in Dingxi county, Gansu Province, ChinaPimentel, D. eds. World Soil Erosion and ConservationCambridge Univ. PressCambridge6386Google Scholar
- Meadows, D.H., Meadows, D.L., Randers, J., Behrens, III W.W. 1972Limits to GrowthUniverse BooksNew YorkGoogle Scholar
- Mesarovic, M.D., Pestel, E. 1974Mankind at the Turning Point: The Second Report to the Club of RomeDuttonNew YorkGoogle Scholar
- Mesarovic, M.D., McGinnis, D.L., West, D.A. 1996Cybernetics of Global Change: Human Dimension and Managing of Complexity, MOST Policy Paper 3UNESCOParisGoogle Scholar
- Postel, S.: 1999, ‘Pillar of Sand: Can The Irrigation Miracle Last?’, Worldwatch Institute.Google Scholar
- Rosegrant, M.W., Paisner, M.S., Meijer, S. and Witcover, J.: 2001, ‘Global Food Projections to 2020: Emerging Trends And Alternative Futures’, International Food Policy Research Institute (IFPRI).Google Scholar
- Sen, A.: 2000, ‘Development as Freedom’, Anchor Books.Google Scholar
- Smil, V.: 2001, ‘Feeding the World: A Challenge for the Twenty-First Century’, , MIT Press.Google Scholar
- Tolba, M.K. 1989Our biological heritage under seigeBioscience39725728Google Scholar
- UNESCO GENIe Coordinating Center: 1997, ‘Reasoning About the Future with GLOBESIGHT Vol. II ’, Case Western Reserve University, Cleveland, Systems Engineering Department.Google Scholar
- United Nations, 1998: Revision of the World Population Estimates and Projections: 1998Google Scholar
- Kyoto Protocol to the United Nations Framework Convention on Climate Change: 2004, html.http://unfccc.int/documentation/items/2643.php.
- USDA, Summary Report 1992: 1994, Natl., Resources Inventory, Washington, D.C., Soil Conservation ServiceGoogle Scholar
- Vali, A.M.: 2002, Complex Systems Approach to Sustainability: Beyond Carrying Capacity Constraints, Ph.D. Thesis, Case Western Reserve University, Cleveland, Ohio, USAGoogle Scholar
- Wen, D. 1993Soil erosion and conservation in ChinaPimentel, D. eds. Soil Erosion and ConservationCambridge Univ. PressNewYork6386Google Scholar
- WHO (World Health Organization): 2005, http://www.who.int/home-page/
- World Energy Outlook 20002000Int. Energy AgencyOECD/IEAParis, FranceGoogle Scholar
- WWF Living Planet Report 2004, http://www.panda.org/downloads/general/lpr2004.pdf.