Methanogenic bacteria
CO2 + 4H2 -> CH4 + 2H2O
reduce C with H2 -> CH4
C from CO2, formate,
methanol & acetate
H from H2, formate, methanol & acetate
prevent accumulation of C in sediments
by releasing it back to atmosphere
also prevent accumulation of O2 in air
(O2 intolerant)
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