It’s a multiple step process. First, you need to separate carbon dioxide from seawater, which is 140 times more concentrated than in the air. Second, you need to split the water molecules into hydrogen and oxygen (which can be done by a well known process of electrolysis). Then, you need to react the CO2 and H2 together using a catalyst (iron in this case) and a lot of heat to get a mixture of methane, syngas, and waxes. Out of that you need to separate syngas and convert it into jet fuel. A lot of energy is needed for all of those steps, which is why it might not turn out to be cost-effective for a long time, until technology improves and oil prices rise again.
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