# Charles David Keeling Back to [[Topics/Climate Change Science and Policy Debate/Climate Change Science and Policy Debate|Climate Change Science and Policy Debate]] · [[Topics/Climate Change Science and Policy Debate/Research and Evidence|Research and Evidence]] **Role:** Geochemist (Scripps, 1928–2005); creator of the Keeling curve and the Keeling plot. - Started continuous CO₂ measurements at Mauna Loa in 1958 (the Keeling curve). - **Keeling 1958**, *Geochimica et Cosmochimica Acta* 13:322 ([doi](https://doi.org/10.1016/0016-7037(58)90033-4)): introduced the "Keeling plot" (δ¹³C against 1/CO₂) to find the isotope signature of a CO₂ **source** mixing into background air, a local, two-component method. Cohler applies it to the whole global carbon cycle, where the two-component assumption fails (see the [[Users/@cohler/Post Analyses/Post Analysis - cohler on the Keeling Intercept and Fossil CO2 (2026-10-24)|Cohler seed analysis]], claim 3). - His son Ralph Keeling continues the Scripps CO₂ and O₂/N₂ records.