Uploaded June 2021 | Updated September 2026, 4 days ago

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Levels of the greenhouse gas carbon dioxide eclipsed 420 parts per million for the first time in human history. 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.

Follow twitter.com/keeling_curve for daily updates on atmospheric carbon dioxide levels.

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