Discussion We found a decreasing trend of E from 1957–1990 which is in line with the previous finding that the proportion of carbon emissions remaining in the atmosphere (airborne fraction) was increasing during this period [ 9 ].
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The sentences
The results from CAMS (1981–1988), Jena_s76 (1978–1988) and Jena_s81 (1983–1988) start too late to detect a significant trend before the Mt.