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The Role of Plate Tectonic-Climate Coupling and Exposed Land Area in the Development of Habitable Climates on Rocky Planets cites a few references for the global carbon cycle model. The diagram on page 8 seems to imply that subduction is the only sink.


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There aere too many unknowns to give reliable figures for the varying levels of oxygen in the atmosphere in Precambrian times. What can be said with a fair degree of certainty is that photosynthetic cyanobacteria evolved about 3.5 billion years ago. At first the oxygen they produced was absorbed by the ocean, but by about 3 billion years ago it began to ...


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