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Mauna Loa CO2 record, 1958-2015. Graph showing the results of the carbon dioxide (CO2) measurements (as a monthly mean) from 1958 to the present (January 2016), obtained at the Mauna Loa Observatory, Hawaii. Relatively isolated due to its mid-Pacific location, this is the longest record made of direct measurements of atmospheric CO2. It shows a steady increase in concentrations (measured in parts per million, ppm) from less than 320 ppm to over 400 ppm. Started by C. David Keeling of the Scripps Institution of Oceanography in March 1958, the graph is known as the Keeling Curve. This increase in CO2 is a key cause of global warming.
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