(Sarah of the Clue Crew reports from a beach UC San Diego's Scripps Institution of Oceanography.)  In 1958, Scripps scientist Charles Keeling began using flasks to measure this gas in the atmosphere; the "Keeling curve" is a symbol of climate change
The Scripps CO2 measurements at Mauna Loa have been ... a technology 
company that is collaborating with Scripps to expand ... in the measured levels of 
the greenhouse gas carbon dioxide in the ... A daily record of atmospheric carbon 
dioxide from Scripps Institution of Oceanography at UC San Diego.