The Keeling Curve Hits 420 PPM

Robert MonroeMost Popular, Videos

Levels of the greenhouse gas carbon dioxide eclipsed 420 parts per million for the first time in human history in 2021. Scripps Institution of Oceanography updated this animation, which explains the rise of carbon dioxide concentration in the atmosphere over the past 300 years and the measurement our researchers collect at Hawaii’s Mauna Loa, known as the Keeling Curve. When Scripps Oceanography scientist Charles David Keeling first began taking measurements in 1958, CO2 levels were at 315 parts per million.

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