Mauna Loa Seas Adj Fossil Fuel Trend

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Description:
Black Curve: Seasonally adjusted 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.). The line through the dots is a spline fit to the data.

Red Curve: Fossil fuel trend of a fixed fraction (57%) of the cumulative industrial emissions of CO₂ from fossil fuel combustion and cement production. This fraction was calculated from a least squares fit of the fossil fuel trend to the observation record.

Data from Scripps CO₂ Program.
Last updated October 2009.