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L'objectif de cet article est double. Dans une premiere partie, nous resumons brievement l'etat des connaissances scientifiques concernant le probleme de l'impact potentiel des activites humaines sur le climat. Ce point s'appuie largement sur les conclusions du recent rapport du GIEC/IPCC (Groupe d'experts intergouvernemental sur l'evolution du climat). On constate l'accroissement des concentrations...