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. 2020 Nov 11;96(9):394–419. doi: 10.2183/pjab.96.030

Figure 3.

Figure 3.

Variations in the mole fraction (upper panel) and growth rate (lower panel) of atmospheric CO2 at Mauna Loa, Hawaii and the South Pole. The smooth lines in the upper panel show a long-term trend, and the shaded vertical bars in the lower panel represent El Niño occurrences.