The Keeling Curve

To provide a resource for understanding the implications of rising CO2 levels, Scripps Institution of Oceanography at UC San Diego is providing daily updates of the "Keeling Curve," the record of atmospheric CO2 measured at Hawaii's Mauna Loa.

These iconic measurements, begun by Charles David (Dave) Keeling, a world-leading authority on atmospheric greenhouse gas accumulation and Scripps climate science pioneer, comprise the longest continuous record of CO2 in the world, starting from 316 ppm in March 1958 and approaching 400 ppm today with a familiar saw-tooth pattern. For the past 800,000 years, CO2 levels never exceeded 300 parts per million.

Visit http://keelingcurve.ucsd.edu/ for background information about how CO2 is measured, the history of the Keeling Curve, and resources from other organizations on the current state of climate.

Follow @keeling_curve on Twitter for the most recent Keeling Curve CO2 reading in a daily tweet.