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Description:
Black Curve: Monthly average atmospheric carbon dioxide concentration versus time at Mauna Loa Observatory, Hawaii (20°N, 156°W) where CO2 concentration is in parts per million in the mole fraction (p.p.m.). Weekly data are shown as dots and connected with straight lines. The record is distinguished by its pronounced seasonal cycle.
Red Curve: Monthly average atmospheric carbon dioxide concentration versus time at the South Pole, Antarctica where CO2 concentration is in parts per million in the mole fraction (p.p.m.). Monthly data points are shown as dots and connected approximately by a smooth curve.
Data from Scripps CO2 Program.
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