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CH4 + 2 O2 → CO2 + 2 H2O (ΔH = −891 kJ/mol (at standard conditions) Most methane naturally generated goes into the atmosphere. Methane generated for energy production would not, but CO2 would be a product. So that ls in hydrogen's favor.

Would methane be better? Dung Beetle: The methane gas powered car that leaves nothing to waste | Mail Online

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