Mauna Loa and South Pole Difference

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Description:
Black Dots: Difference of the monthly average atmospheric carbon dioxide concentration at Mauna Loa Observatory, Hawaii and South Pole, Antarctica versus time where CO₂ concentration is in parts per million in the mole fraction (p.p.m.).

Black Curve: Spline fit to the CO₂ data.

Data from Scripps CO₂ Program.
Last updated May 2009.