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You can produce methane from water and carbon dioxide. Burning it is the reverse.

Burning synthetic methane is carbon neutral.

That's cool, guess the full cycle carbon footprint is dependent on what you use to power the water + co2 -> methane process.

If they use natural gas (methane) to make electricity to make synthetic methane, I will cry

They need to be able to do it on Mars, so the only options are solar or nuclear power.

I'm sure that was included in the plan. It's a perfect application for solar power.