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Réchauffement planétaire

Climat : le dernière décennie fut la plus chaude des annales

Ceux qui ont commencé à douter de la réalité du réchauffement de la planète devraient prendre en compte les derniers chiffres de la NASA. Il semble que la dernière décennie ait été la plus chaude mesurée, malgré un 2008 relativement frais.
"L'Institut d'étude spatiale Goddard de la Nasa (Giss) a publié ses chiffres pour l'année 2009, révélant que cette dernière a été la deuxième année la plus chaude des 130 années dont les températures ont été enregistrées. Elle se place juste derrière 2005, et presque ex aequo avec 1998, 2002, 2003, 2006 et 2007, l'année 2008 ayant été la plus froide de la décennie en raison de la force du courant marin La Niña."Il y a des variations importantes des températures terrestres d'une année sur l'autre, provoquées par l'influence alternée des courants de l'océan Pacifique El Niño (chaud) et La Niña (froid)" explique James Hansen, le directeur du Giss. "Mais quand on fait la moyenne des températures sur cinq ou dix ans pour lisser ces fluctuations annuelles du thermomètre, on peut voir que le réchauffement planétaire se poursuit sans relâche" souligne-t-il.Depuis 1880, une nette tendance au réchauffement est constatée à la surface du globe, les températures ayant grimpé d'environ 0,2 degré Celsius par décennie au cours des trente dernières années, grimpant au total de 0,8 degré depuis 1880.Pour dresser ce bilan, le Giss s'est basé sur des données fournies par plus d'un millier de stations météorologiques situées tout autour de la Terre, des mesures de températures à la surface des océans effectuées par des satellites ainsi que des données venant des stations de recherche dans l'Antarctique."


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