Plaque commemorating the location of first direct carbon dioxide measurements, showing the graph of CO2. NOAA's atmospheric and space observatory, at 3400 meters on the northeast flank of Mauna Loa volcano in Hawaii. The observatory consists of 10 buildings from which up to 250 different atmospheric parameters are measured. Measuring carbon dioxide at this location begun in 1958 at the request of Charles David Keeling of Scripps Oceanographic Institution, and has created the longest continuous r
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