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Originally Posted by RedDevil
I bet the Mirai can use methane as a fuel instead of hydrogen. It would be easy enough - methane is less volatile anyway.
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Which of course raises the question of why they don't just use the methane directly, either in fuel cells or natural gas power plants, rather than converting it to one of the most difficult to store & transport elements? Or react it with a bit more carbon, and produce liquid hyudrocarbons?
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Burning it produces some CO₂, of course...
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But the CO2 would be released anyway, as the sewage decomposes. The problem is not CO2
per se, because that's just part of the normal carbon cycle on which life depends. It's the addition of fossil CO2 that's the problem.