The atmospheric carbon dioxide (CO2) measurements made at Mauna Loa Observatory, Hawaii, since 1958 provide unambiguous evidence for human alteration of the environment on a global scale (Fig. 1.18). The data through 1973 are from Keeling et al. (1982), while data since 1973 are from the NOAA program (Thoning et al. 1989).
Because the infrared absorption properties of the greenhouse gases and their role in determining global climate are well understood, it is certain that the CO2 increase will alter the radiative forcing of the climate system. However, because the earth's climate is very complex and involves the atmosphere, the oceans, ice sheets, and living systems, it is much more difficult to predict how climate change will be manifested. The ongoing measurements will provide a better understanding of the natural carbon cycle and thus assist in the formulation of rational and informed policies concerning climate change and possible mitigation strategies.
Climate and Global Change Issues - Trace Gases: Methane
Climate and Global Change Issues - Trace Gases: Ozone
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