It requires a lot of energy to do this, obviously. I don't know the exact details, but my naive assumption is that they require hydrogen as an intermediate, whi

It requires a lot of energy to do this, obviously. I don't know the exact details, but my naive assumption is that they require hydrogen as an intermediate, which would also imply they need relatively pure water as a source. Altogether I just don't know why they decided to take this from the air rather than build a plant in any major port with a refinery installed, which would seem to be much cheaper.