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Water and Land Resources and Global Food Supply

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  • Rosegrant, Mark W.
  • Ringler, Claudia
  • Gerpacio, Roberta V.

Abstract

The world population is expected to grow to 7.7 billion in 2020, from 5.3 billion in 1993 (UN, 1996). Although the latest population projections represent a slowdown from past estimates, the large absolute increase in population raises serious concerns about how food demand will be met in the next decades, especially in the context of a possibly stagnant or even decreasing stock of natural resources. These concerns have escalated sharply in recent years, in the face of dramatic increases in world cereal prices in 1996, combined with declining cereal stocks, and the simultaneous appearance of several widely read publications presenting the possibility of a starving world in the next century, unable to meet growing food demands from a deteriorating natural resource base (Brown, 1995; Tyler, 1995; Brown and Kane, 1994). In this paper, we examine the prospects for global food supply and demand for the year 2020, in the light of the two most often identified natural resource constraints, land and water. We first briefly summarize recent trends in area, yield and production for cereal crops, the key staple crops for most of the world, describe the IMPACT global food projections model and present an overview of food demand and supply projections. We then ask whether land and water constraints will pose serious threats to long-term cereal production growth. In particular, we assess the effects of land degradation and land conversion to urban uses on agricultural production and the effect of increasing water scarcity on future global food supply. For the latter assessment, we develop projections of global water demand until 2020 that are consistent with the underlying assumptions in the global food projections. We conclude with implications for land and water policy.

Suggested Citation

  • Rosegrant, Mark W. & Ringler, Claudia & Gerpacio, Roberta V., 1997. "Water and Land Resources and Global Food Supply," 1997 Conference, August 10-16, 1997, Sacramento, California 197039, International Association of Agricultural Economists.
  • Handle: RePEc:ags:iaae97:197039
    DOI: 10.22004/ag.econ.197039
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    References listed on IDEAS

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    1. Mark W. Rosegrant & Prabhu L. Pingali, 1994. "Policy and technology for rice productivity growth in Asia," Journal of International Development, John Wiley & Sons, Ltd., vol. 6(6), pages 665-688, November.
    2. Seckler, D., 1996. "The new era of water resources management: from \dry\ to \wet\ water savings," IWMI Research Reports H018206, International Water Management Institute.
    3. Crosson, Pierre, 1986. "Sustainable food production : Interactions among natural resources, technology and institutions," Food Policy, Elsevier, vol. 11(2), pages 143-156, May.
    4. Bhadra, D. & Brandao, A.S.P., 1993. "Urbanization; Agricultural Development; and Land Allocation," World Bank - Discussion Papers 201, World Bank.
    5. Alt, Klaus & Osborn, C. Tim & Colacicco, Daniel, 1989. "Soil Erosion: What Effect on Agricultural Productivity?," Agricultural Information Bulletins 309483, United States Department of Agriculture, Economic Research Service.
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    Citations

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    Cited by:

    1. Webb, Patrick & Iskandarani, Maria, 1998. "Water Insecurity and the Poor: Issues and Research Needs," Discussion Papers 279785, University of Bonn, Center for Development Research (ZEF).
    2. Khan, Shahbaz & Tariq, Rana & Yuanlai, Cui & Blackwell, J., 2006. "Can irrigation be sustainable?," Agricultural Water Management, Elsevier, vol. 80(1-3), pages 87-99, February.
    3. Herdt, Robert W., 2001. "Changing Priorities for International Agricultural Research," Distinguished Economist Lectures 7659, CIMMYT: International Maize and Wheat Improvement Center.
    4. Selvarajan, S. & Ravishankar, A. & Prasanna, P.A. Lakshmi, 2001. "Irrigation Development and Equity Impacts in India," Policy Papers 344984, ICAR National Institute of Agricultural Economics and Policy Research (NIAP).
    5. Rosegrant, Mark W. & Ringler, Claudia, 1999. "Impact on food security and rural development of reallocating water from agriculture:," EPTD discussion papers 47, International Food Policy Research Institute (IFPRI).
    6. Charlotte Fraiture, 2007. "Integrated water and food analysis at the global and basin level. An application of WATERSIM," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 21(1), pages 185-198, January.
    7. Cai, X.L. & Sharma, B.R., 2010. "Integrating remote sensing, census and weather data for an assessment of rice yield, water consumption and water productivity in the Indo-Gangetic river basin," Agricultural Water Management, Elsevier, vol. 97(2), pages 309-316, February.
    8. Pinstrup-Andersen, Per, 2000. "Food policy research for developing countries: emerging issues and unfinished business," Food Policy, Elsevier, vol. 25(2), pages 125-141, April.
    9. Holland, Stephen P. & Moore, Michael R., 2000. "Cadillac Desert Revisited: Property Rights, Public Policy, And Water-Resource Depletion In The American West," 2000 Annual meeting, July 30-August 2, Tampa, FL 21861, American Agricultural Economics Association (New Name 2008: Agricultural and Applied Economics Association).

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