BACK      List of illustrations    HOME
The Discovery of Global Warming                     December 2005

The “Keeling curve” of CO2 measured at Mauna Loa, Hawaii over nearly half a century. Within the long-term rise are annual fluctuations as Northern Hemisphere plants take up carbon during summer growth and release it in winter decay. For a more recent curve see the Scripps site.

Scripps Institution of Oceanography, reproduced by permission.