"Nature doesn't do bailouts."
"A new, deeply pessimistic framework for understanding the earth's ecology - and our place in it - has emerged. Many of us know, in outline, the warm, fuzzy Gaia hypothesis, first outlined by James Lovelock. It claims that the Planet Earth functions, in effect, as a single living organism called Gaia. It regulates its own temperature and chemistry to create a comfortable steady state that can sustain life. So coral reefs produced cloud-seeding chemicals which then protect them from ultraviolet radiation. Rainforests transpire water vapour so generate their own rainfall. This process expands outwards. Life protects life.
"Now there is a radically different theory that is gaining adherents, ominously named the Medea hypothesis. The paleontologist Professor Peter Ward is an expert in the great extinctions that have happened in the earth's past, and he believes there is a common thread between them. With the exception of the meteor strike that happened 65 million years ago, every extinction was caused by living creatures becoming incredibly successful - and then destroying their own habitats. So, for example, 2.3 billion years ago, plant life spread incredibly rapidly, and as it went it inhaled huge amounts of heat-trapping carbon dioxide from the atmosphere. This then caused a rapid plunge in temperature that froze the planet and triggered a mass extinction.
"Ward believes nature isn't a nurturing mother like Gaia. No: it is Medea, the figure from Greek mythology who murdered her own children. In this theory, life doesn't preserve itself. It serially destroys itself. It is a looping doomsday machine. This theory adds a postscript to Darwin's theory of the survival of the fittest. There is survival of the fittest, until the fittest trash their own habitat, and do not survive at all."
