Diversity Reading List

Abstract: The Gaia theory of James Lovelock proposes that the Earth is a self-regulating system, or super-organism, maintaining conditions hospitable to contemporary planetary biota. Objections to this theory, concerning its alleged untestability and circularity, are considered and countered. Favourable evidence includes Lovelock’s daisyworld model of a planet regulating its own temperatures and thus maintaining homeostasis, and his discoveries of actual regulatory mechanisms such as the biological generation of dimethyl sulphide, which removes sulphur from the oceans and seeds clouds whose albedo reduces solar radiation (a negative feedback mechanism). After some decades of scepticism, sections of the scientific community have partially endorsed Gaia theory, accepting that the Earth system behaves as if self-regulating. Whether or not this theory is acceptable in full, it has drawn attention to the need for preserving planetary biological cycles and for the planetary dimension to be incorporated in ethical decision-making, and thus for a planetary ethic.

Abstract: The idea of Gaia—of life on earth as a self-sustaining natural system—is not a gratuitous, semi-mystical fantasy. It is a really useful idea, a cure for distortions that spoil our current world-view. Its most obvious use is, of course, in suggesting practical solutions to environmental problems. But, more widely, it also attacks deeper tangles which now block our thinking. Some of these are puzzles about the reasons why the fate of our planet should concern us. We are bewildered by the thought that we might have a duty to something so clearly non-human. But more centrally, too, we are puzzled about how we should view ourselves. Current ways of thought still tend to trap us in the narrow, atomistic, seventeenth-century image of social life which grounds today's crude and arid individualism, though there are currently signs that we are beginning to move away from it. A more realistic view of the earth can give us a more realistic view of ourselves as its inhabitants.