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> I'm not sure what a Sabatier is.

https://en.wikipedia.org/wiki/Sabatier_reaction#Manufacturin...

Thanks! Good suggestion. A few alternative “scenarios” with some presets could be nice.

Methane generator, for in situ fuel production. "Sabatier reaction".

It's talking about the Sabatier process, which takes hydrogen and carbon dioxide, and puts them with a nickel catalyst and high pressure to make water and methane (useful for rocket propellant)