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The “Keeling curve” of CO2 measured at Mauna Loa, Hawaii, as seen in 1971. (The annual cycle reflects uptake and release of the gas from plants and soil in the northern hemisphere.) The full curve through 2004 is shown here.

From Inadvertent Climate Modification. Report of Conference, Study of Man's Impact on Climate (SMIC), Stockholm, edited by Carroll L.Wilson and William H. Matthews , p. 234, copyright MIT Press, 1971.