An ecological-evolutionary theory that expands on the original Gaia Hypothesis (Earth as a self-regulating system). It proposes that planetary biospheres possess not just homeostatic (Gaia) tendencies, but also self-destructive or "self-culling" (Medea) mechanisms as inherent traits of complex life. Named after the mythological Medea who killed her own children, it posits that life, in its success, inevitably creates conditions for its own mass extinction (e.g., oxygen pollution by cyanobacteria, climate change from industrialization). This isn't an external punishment, but a built-in evolutionary dynamic where dominant species or metabolic pathways eventually destabilize the very system that birthed them.
Example: The original Gaia Hypothesis saw early cyanobacteria producing oxygen as a life-giving act. The Gaia-Medea Hypothesis reframes it: cyanobacteria were the first "Medean" organisms, releasing a toxic waste product (oxygen) that caused a mass extinction of anaerobic life (the Great Oxygenation Event). Humanity's fossil fuel consumption is not an anomaly, but a predictable "Medean" phase: a highly successful species (us) using a dominant metabolic pathway (combustion) that threatens the biosphere's stability. The hypothesis suggests intelligence may be a planet's ultimate Medean trait—a tool for both unprecedented regulation and unprecedented self-destruction.
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