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ReadRightRed99 t1_j2bvso6 wrote

Reply to comment by Psychological_Wheel2 in Question by Psychological_Wheel2

Something that occurred to me is that usually we create hydrogen from … water. You can do it by different methods, electrolysis being a common one. So I’m afraid we might run into a hydrogen problem before we even get very far along.

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Psychological_Wheel2 OP t1_j2bw8go wrote

Could we just “collect” it for the galaxy

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EverlastingM t1_j2cgn76 wrote

There's lots of hydrogen in space but it's spread so thin it's basically non-existent. On the other hand, every year we collectively emit 41 billion tonnes of water made from hydrogen that has been locked away in hydrocarbons. Also CO2 which is the part we're usually concerned about.

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PuddleCrank t1_j2byq7j wrote

The current cheapest way to make hydrogen is I believe from steam reforming methane.

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