In ‘Gaia: A New Look at Life on Earth’ (1979), James Lovelock proposed that the Earth is something like a single living organism, capable of manipulating its circumstances and the environment to suit its needs. While many scientists reject the fullest formulation of this idea, it has nonetheless had a profound influence on our understanding of the ways in which animal and plant life interact with the non-living parts of the environment, to the extent that observations in biological and earth systems science are often assessed for which version of Gaia they might support.

In this episode, Meehan Crist and Peter Godfrey-Smith look at the origins of the Gaia hypothesis in the radical work of Lynn Margulis and the contributions of Lovelock’s academic collaborator Dian Hitchcock, and in the science of cybernetics. They then consider the degree to which any formulation of Gaia can explain certain processes, from the impact of the ecological competition between daisies on the reflection of solar radiation to the carbon-silicate cycle and its control of carbon dioxide levels, and consider some of Lovelock’s wilder theories, including his suggestion that humans should merge their minds with those of whales.

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