The Origin And Nature Of Life On Earth by Eric Smith

The Emergence of the Fourth Geosphere

Explores how life arose as a natural consequence of planetary physics, with energy flows and geochemical cycles driving the transition from prebiotic chemistry to self-sustaining metabolic networks and, eventually, genetic systems. Integrating insights from thermodynamics, geology, and biochemistry, it argues for metabolism-first origins centered on carbon fixation and redox networks, plausibly in hydrothermal settings. The biosphere is framed as a tightly coupled fourth geosphere, making life’s emergence on Earth-like worlds a predictable outcome.

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