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FIGURE 26 . Thomas Chrowder Chamberlin (1843-1928). Source : ht-
tp://commons.wikimedia.org/wiki/File:PSM_V51_D808_Thomas_Chrowder_Chamberlin.jpg ;
Popular Science Monthly (1897).
Preventing an Ice Age
MoresupportcamefromArrhenius'scolleagueNilsEkholm(1848-1923),whore-
sponded in a sixty-one-page paper in 1901. 17 The title of one section left no doubt
as to his opinion: “Variations in the amount of carbonic acid (CO 2 ) in the atmo-
sphere are the principal causes of the great climatic variations during geological
ages.” Arrhenius's model, Ekholm wrote, was “the only one which has stood the
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