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This is a graph of the seasonally adjusted version of the ‘Keeling Curve’, that is it removes any seasonal fluctuations. It shows over fifty years of measurements, from September 1957 through to January 2016, of the concentration of carbon dioxide in the atmosphere, and charts its rise from 315 parts per million at the start of the period to just over 400 parts per million at the end. The curve rises smoothly and steadily over the fifty year period, but with a slightly higher gradient at the end of the period than at the start.

 3.7 The Keeling Curve