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Charles David Keeling
Charles David Keeling (April 20, 1928 – June 20, 2005) was an American scientist whose recording of carbon dioxide at the Mauna Loa Observatory first alerted the world to the possibility of anthropogenic contribution to the "greenhouse effect" and global warming. The Keeling Curve measures the progressive buildup of carbon dioxide, a greenhouse gas, in the atmosphere.
==Early life and early career==
Keeling was born in Scranton, Pennsylvania. He graduated with a degree in chemistry from the University of Illinois in 1948 and earned a PhD in chemistry from Northwestern University in 1954. He was a postdoctoral fellow in geochemistry at the California Institute of Technology until he joined Scripps Institution of Oceanography in 1956, and was appointed professor of oceanography there in 1968.
At Caltech he developed the first instrument to measure carbon dioxide in atmospheric samples. Keeling camped at Big Sur where he used his new device to measure the level of carbon dioxide and found that it had risen since the 19th century.
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