Dr. Charles D. Keeling died on Monday at the age of 77 at his home in Montana. Dr. Keeling performed seminal research on the topic of global climate change by demonstrating that global carbon dioxide levels have steadily increased over the last century. To read more about Dr. Keeling and the "Keeling Curve", visit our module on the Carbon Cycle.

The “Keeling curve,” a long-term record of atmospheric CO2 concentration measured at the Mauna Loa Observatory (Keeling et al.).

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