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Climate & Environment · Recorded milestone

Keeling curve

Recorded year1958

Charles Keeling's Mauna Loa station begins measuring rising atmospheric CO2.

Explore this milestone on the interactive map

Built on

Triode amplifierRecorded · 1906requires

Led to

Climate modelRecorded · 1967enables
Farmland as a carbon sinkRecorded · 2019enables
Methane-cutting cattle feedRecorded · 2022enables

Sources & evidence

Additional source

Dataset updated 2026-10-18. This individual record has not been separately re-reviewed.