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Finalement, c’est dans le cadre de l’année internationale de géophysique de 1958 que des mesures précises et systématiques de la concentration de l’atmosphère en CO2 ont commencé à être réalisées : Charles D. Keeling installa ses instruments au milieu de l’océan Pacifique à Mauna Loa (à Hawaii), c’est à dire loin des régions dans lesquelles de grandes quantités de CO2 était émises (villes, sites industriels.). Au bout d’une dizaine d’années, ses mesures montrèrent que la concentration de CO2 augmentait au fils des années, et cette augmentation continue depuis.

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