The Ecclesia

Long-Term Carbon Cycle

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Long-Term Carbon Cycle

Source: James Walker, P.B. Hays & James Kasting, Journal of Geophysical Research 86, 1981 Institution: University of Michigan

Finding

Earth’s surface temperature is regulated over geological timescales by a negative feedback loop: when temperatures rise, silicate weathering accelerates (CaSiO3 + CO2 → CaCO3 + SiO2), consuming CO2, reducing the greenhouse effect, cooling the planet. When temperatures fall, weathering slows, volcanic CO2 accumulates, warming resumes. This thermostat has operated for billions of years, keeping Earth habitable despite a 30% increase in solar luminosity since the Archean.

Pattern Mapping

Proportion — Physical proportional response. Warming triggers cooling proportional to the warming. The system does not overcorrect into runaway states (within limits — see Snowball Earth).

Alignment — Weathering rate and climate state are structurally coupled. The thermostat works because the same physical processes that determine temperature also determine weathering rate. Aligned by chemistry, not by intent.

Non-fabrication — The thermostat is a real identified mechanism with testable predictions, not a metaphor for planetary “self-regulation.” Specific chemistry, not agency.

Connections

  • Plate Tectonics — tectonic processes drive volcanic CO2 outgassing, the other half of the cycle
  • Snowball Earth — what happens when the thermostat is overwhelmed (→ Meta-Pattern 09: Feedback/Homeostasis)
  • The Greenhouse Effect — the greenhouse mechanism is what the thermostat modulates
  • Homeostasis — geological homeostasis parallels biological (Bernard/Cannon)
  • Le Chatelier’s Principle — the chemical principle underlying the feedback: perturbed equilibrium shifts to counteract
  • Conservation Laws — carbon is conserved through the entire cycle

Status

Established geochemistry. Core concept in long-term climate science and astrobiology. See Beerling, The Emerald Planet (2007). The mapping to the five properties is this project’s structural interpretation.

The mapping to the five properties is this project’s structural interpretation.

Graph View

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