A Walk Through Time


Concept Note

The Gaia hypothesis, developed by British atmospheric chemist James Lovelock and U.S. biologist Lynn Margulis, proposes that planetary processes are neither simply geological and chemical, nor just geochemical; they are geophysiological. Variables such as the mean global temperature, and the salinity and alkalinity of the oceans are sensitive to biological activity.

Earth's geology and biota are a single, tightly coupled evolutionary system. Rocks carry tales as traces of bygone biospheres. (Photograph by Lois Brynes)

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