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| Titel |
Consumptive water use to feed humanity - curing a blind spot |
| VerfasserIn |
M. Falkenmark, M. Lannerstad |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 9, no. 1/2 ; Nr. 9, no. 1/2 (2005-06-09), S.15-28 |
| Datensatznummer |
250006586
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| Publikation (Nr.) |
 copernicus.org/hess-9-15-2005.pdf |
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| Zusammenfassung |
| Since in large parts of the world it is getting difficult to meet growing
water demands by mobilising more water, the discourse has turned its focus
to demand management, governance and the necessary concern for aquatic
ecosystems by reserving an "environmental flow" in the river. The latter
calls for attention to river depletion which may be expected in response to
changes in consumptive water use by both natural and anthropogenic systems.
Basically, consumptive use has three faces: runoff generation influenced by
land cover changes; consumptive use of water withdrawn; and evaporation from
water systems (reservoirs, canals, river based cooling). After demonstrating
the vulnerability to changes in consumptive use under savanna region
conditions - representative of many poverty and hunger prone developing
countries subject to attention in the Millennium Development Goal activities
- the paper exemplifies; 1) changes in runoff generation in response to
regional scale land cover changes; 2) consumptive use in large scale
irrigation systems. It goes on to analyse the implications of seeing food as
a human right by estimating the additional consumptive use requirements to
produce food for the next two generations. Attention is paid to remaining
degrees of freedom in terms of uncommitted water beyond an environmental
flow reserve and to potential food trade consequences (so-called virtual
water). The paper concludes that a human-right-to-food principle will have
major consequences in terms of altered consumptive water use. It will
therefore be essential for humanity to address river depletion to avoid loss
of resilience of the life support system. This will demand a deep-going
cooperation between hydrology, ecology and water governance. |
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