[evandwight]

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

Burning synthetic methane is carbon neutral.

[OldManAndTheCpp]

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

[evandwight]

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

[Isinlor]

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

[sudosysgen]

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