Robert Zubrin was big into la réaction de Paul Sabatier: to turn carbon dioxide into methane. Assuming you had some compound with hydrogen in it, like water. Or maybe sulfuric acid if you're in Venus' clouds.
Sabatier research continues. Apparently for catalyst we're not just stuck with nickel at super-high temperatures and pressures; Jingjie Wu can use carbon. Some catalysts can even produce ethylene. Methanol is noted as well.
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