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Virtual Water, Genuine Problems

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Virtual Water, Genuine Problems

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    2. The concept of ‘virtual water’ Virtual water is the water ‘embodied’ in a product, not in real sense, but in virtual sense. It refers to the water needed for the production of the product. Global trade in goods and services brings along global trade in ‘virtual water’

    3. Assessing the ‘virtual water content’ of products Virtual water content of a crop Crop water requirement (m3/ha) / Crop yield (ton/ha) Virtual water content of an animal Sum of water for feed, drinking and servicing Virtual water content of a crop or livestock product Distribute the virtual water content of the root product over its derived products

    4. Virtual water content of products

    6. Photo: sugar cane field in EgyptPhoto: sugar cane field in Egypt

    9. Photo: beefcowPhoto: beefcow

    12. Assessing virtual water flows Virtual water trade flow (m3/yr) = Trade volume (ton/yr) ? Virtual water content (m3/ton) Global trade data: UN Statistics Division, New York FAOSTAT, FAO, Rome

    13. International virtual water flows (1997-2001) [Chapagain & Hoekstra, 2004] Up-datedUp-dated

    18. Major determinants of a water footprint

    22. Aral Sea in Central Asia

    23. Aral Sea tapped for cotton irrigation

    24. Aral Sea in Central Asia

    25. Aral Sea in Central Asia

    26. Aral Sea in Central Asia

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