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Re:Scientists find likely source of methane on Mars by jayalpha on Wednesday April 03, 2019 @11:39AM (#19564240)
Ok, then you assume that you have accessible water too. Still need the Energy for electrolysis. But with solar or nuclear it may be possible.
Re:Scientists find likely source of methane on Mars by elsonrodriguez on Wednesday April 03, 2019 @12:27PM (#19564711)
Most serious Mars return missions plan on simply bringing 1 ton of hydrogen per every 10 tons of desired methane.

That way you can just rely on the martian atmosphere to produce your return fuel instead of embarking on a entire mining expedition.