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Groenland – Une île de glace à la dérive

Au cours des années 2000, deux autres blocs de glace (de 86 et 27 km² seulement) se sont également détachés du Groenland

Les animaux ne sont pas les seuls à souffrir du réchauffement climatique, la nature elle-même paye un lourd tribut face aux dérèglements qui affectent notre planète. Le Groenland, terre de glace, semble ainsi fondre comme neige au soleil, alors qu’un immense bloc d’eau congelée de 260km² (NDLR : soit près deux fois et demi la taille de Paris) s’est détaché du continent Arctique, dimanche. Un phénomène qui n’avait pas eu lieu depuis 1962 et qui a amputé le glacier Petermann, l’un des derniers du Pôle Nord, d’un quart de sa superficie.

Le réchauffement climatique s’impose comme un coupable tout désigné, surtout que ces dernières années, la calotte glacière du Groenland semble ne pas avoir résisté aux assauts de la hausse des températures selon un rapport du Conseil arctique publié en 2009. Un jugement que tempère tout de même Andreas Muenchow de l’université du Delaware (Etats-Unis). Les vents, la marée et la pression des vagues, autant de phénomènes naturels, peuvent aussi avoir façonné cet iceberg géant (NDLR : c’est ce que l’on appelle le vêlage des glaciers), selon lui.

Ce bloc de glace, haut comme la moitié de l’Empire State Building (NDLR : à New-York), risque de causer d’importants dégâts sur sa route. Les universitaires du Delaware redoutent qu’il prenne la direction du sud et perturbe alors la navigation de plusieurs bateaux. Mais, il prive surtout la terre d’une source prolifique d’eau douce : cet iceberg pourrait en effet suffire à « alimenter l’ensemble du réseau public d’eau potable américain pendant 120 jours », estime Andreas Muenchow. Le Groenland reste, à ce jour, le plus grand réservoir d’eau douce de tout l’hémisphère Nord, qui risque de se tarir si rien n’est entrepris pour le sauver. En outre, la fonte de ses glaciers contribue à la hausse du niveau des océans, qui s’élève tous les ans de 3 millimètres. Une goutte d’eau, certes, mais qui pourrait bien faire boire la tasse à la terre ferme.

Crédit photo : Flickr - longhorndave
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