Table 1 Abiotic inputs of CO2, H2, CH4 and H2SO4.

From: Co-evolution of primitive methane-cycling ecosystems and early Earth’s atmosphere and climate

Abiotic inputs

Range (in molecules cm−2 s−1)

Reference

Volcanic output of CO2

1.2 × 1010– 4 × 1010 (to obtain TGeo ranging from 0 to 20 °C)

ref. 5

Volcanic output of H2

5 × 109–3 × 1011

ref. 12

Serpentinization rate of production of CH4

3.7 × 108–3.7 × 109

ref. 33,42

Deposition rate of H2SO4

107–109

ref. 30

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