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" ... There's nothing particularly odd about the basic thing that's being done here. Seawater contains both carbon dioxide and hydrogen: the CO2 is dissolved into the water and the hydrogen is that H2 part of H2O. So, if you can separate out those two parts then you've got carbon and hydrogen and then we know how to make hydrocarbons from those two and oil is simply one type of hydrocarbon. The process of refining oil (more especially the cracking part) is simply the sorting of the longer, larger and heavier hydrocarbons from the light ones and thus ending up with the series of products that we use, from asphalt to avgas or jet fuel. And we know very well that we can run this process in either direction. ... "