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Original Articles

Climate change and sustainable water resources: placing the threat of global warming in perspective

Modification climatique et durabilité des ressources en eau: dans la perspective d'une menace de réchauffement planétaire

Pages 541-557 | Published online: 25 Dec 2009
 

Abstract

Predicted climate change over the coming decades is likely to add measurable stress to water resources in many regions of the world, including some areas that are currently well endowed. The stresses are likely to involve changes in the frequency of extreme events as well as gradual changes in mean annual net resources. The paper analyses these predictions. It also attempts to place them in context, first, comparing their impact with other major barriers to sustainability, such as increasing demand, wastage, poor water resources assessment and international conflict, and, secondly, considering the limitations of current predictive techniques.

Résumé

Les modifications climatiques devant se produire au cours des prochaines décennies devraient aggraver le stress hydrique dans de nombreuses régions du monde, y compris dans certaines d'entre elles actuellement bien pourvues en eau. On doit s'attendre à des modifications concernant aussi bien la fréquence des événements extrêmes que les modules annuels. Cet article s'intéresse à ces prédictions et s'efforce de les remettre en perspective, en comparant leurs impacts à ceux d'autres obstacles à la durabilité comme la croissance de la demande, les rejets, les incertitudes pesant sur l'évaluation des ressources et les conflits internationaux, mais aussi en prenant en considération les limites actuelles capacités de prédiction.

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