|BACK List of illustrations HOME|
|The Discovery of Global Warming December 2009|
The "Keeling curve" of CO2 measured at Mauna Loa, Hawaii, as seen in 1971. (The annual cycle reflects uptake and release of the gas from plants and soil in the northern hemisphere.) The full curve into the 21st century is shown here. A gap in 1964 was due to problems that could have been avoided with better funding.