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'Charles David Keeling was a stickler for precision. The measurements of CO2 he began in the 1950s were an order of magnitude more accurate than previous measurements. In recognizing the value of a continuous record, and obtaining it, he brought a clarity to the problem that altered our perceptions about global change and the degree to which the Earth can absorb the human assault.'

Dr. James Hansen



Rewards and Penalties for Monitoring the Earth

Charles David Keeling, 1998


Images courtesy of the Scripps Institution of Oceanography

Understanding the Keeling Curve