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The Story of the Second Greenhouse Gas – CH4
- Charles David Keeling established measurements
- The idea of making measurements at Mauna Loa arose while Charles David Keeling was a post-doc at Cal Tech. In the course of working on a project involving carbon in river water - a project that incidentally required making measurements of CO2 in air - Charles David Keeling made a key discovery. What he discovered was that when he sampled the air remote from forests, cities, and other obvious sources or sinks for CO2, he always got almost the same value of 310 ppm. Previous measurements of CO2 in the atmosphere did not show such constancy