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Eau et énergie ne peuvent pas se passer l'une de l'autre

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Au moment où les ressources en eau se raréfient, la consommation du secteur de l'énergie a été l'un des thèmes les plus débattus du 5e Forum de l'eau, qui s'est achevé le 22 mars, à Ankara. L'expert danois Henrik Larsen a présenté pour la première fois une estimation de la quantité d'eau nécessaire à la production d'un mégawattheure en fonction de la filière énergétique. Tous les modes de production ont besoin d'eau, qu'il s'agisse de la fabrication des matériaux, de l'extraction des ressources, du refroidissement des centrales, etc. La consommation de l'hydroélectricité est due à une importante évaporation. Les agrocarburants battent des records.

Aux Etats-Unis, 39 % de l'eau prélevée est utilisée pour la production d'énergie (contre 31 % en Europe), et cette consommation augmentera à l'avenir. "C'est un élément supplémentaire à prendre en compte dans les politiques énergétiques", affirme Henrik Larsen. Parallèlement, l'énergie est indispensable au traitement, aux transferts et au dessalement de l'eau. (www.lemonde.fr)

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