Medea hypothesis
The Medea hypothesis is a term coined by paleontologist Peter Ward[1] for the anti-Gaian hypothesis that multicellular life, understood as a superorganism, is suicidal; in this view, microbial-triggered mass extinctions are attempts to return the Earth to the microbial-dominated state it has been for most of its history.[2][3][4] The metaphor refers to the mythological Medea (representing the Earth), who kills her own children (multicellular life).
Past "suicide attempts" include:
- Methane poisoning, 3.5 billion years ago
- The oxygen catastrophe, 2.45 billion years ago
- Snowball earth, twice, 2.4-2.1 billion years ago and 790–630 million years ago
- At least five putative hydrogen sulfide-induced mass extinctions, such as the Great Dying, 252.28 million years ago
The list does not include the Cretaceous–Paleogene extinction event, since this was, at least partially, externally induced by a meteor impact.
See also
References
- ↑ Peter Ward (2009), The Medea Hypothesis: Is Life on Earth Ultimately Self-Destructive?, ISBN 0-691-13075-2
- ↑ Gaia's evil twin: Is life its own worst enemy? The New Scientist. Volume 202, Issue 2713, 17 June 2009, pages 28–31 (Cover story)
- ↑ Bennett, Drake (2009-01-11). "Dark green: A scientist argues that the natural world isn't benevolent and sustaining: it's bent on self-destruction". The Boston Globe. Retrieved 2010-02-26.
- ↑ Grey, William (February 2010). "Gaia theory – Reflections on life on earth". Australian Review of Public Affairs. University of Sydney. Retrieved 2010-02-26.
External links
- Peter Ward's lecture
- The Medea Hypothesis: A response to the Gaia hypothesis Review of Ward's book, February 12, 2010 .
- Paleontologist Peter Ward’s “Medea hypothesis”: Life is out to get you Scientific American review, January 13, 2010
- The Medea Hypothesis Review by the Astrobiology Society of Britain.
- The Medea Hypothesis: Is Life on Earth Ultimately Self-Destructive? Outlook for the world is still grim Review in the Times Educational Supplement
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Minor events Major events │ −600 │ −550 │ −500 │ −450 │ −400 │ −350 │ −300 │ −250 │ −200 │ −150 │ −100 │ −50 │ 0 Millions of years before present |
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