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Isnt the ratio closer to ~6 tons of CO2 per ton of H2? You get CO2 + 4 H2, which weigh 44 and 4*2 respectively.

Also, isnt this a non-issue, because (at least in theory) the reaction is contained in your converter plant, where you can collect the CO2?

That's quote from wikipedia. I think you're right with your calculations, so I don't really know where this number came from.

What're you going to do with that collected CO2 other than releasing it to the atmosphere?

Separating from other gasses, followed by sequestering.

I guess that it would cost a lot. Technically you can do that with traditional coal plants.

Those don't produce fuel. They produce electricity.