This is hype. Anybody that presents terms like "green hydrogen", "blue hydrogen", emphasizing the renewable nature of hydrogen, is BSing you. The case will ne

This is hype. Anybody that presents terms like "green hydrogen", "blue hydrogen", emphasizing the renewable nature of hydrogen, is BSing you. The case will never close on these merits. The case can't even close on a prototype basis unless we're using liquid hydrogen. Gaseous pressure vessels are orders of magnitude too heavy. What liquid hydrogen combustion does in the short term is gives you a fuel that's difficult to produce & distribute but more than twice as effective gravimetrically as fossil fuels, so long as you design a plane around the fuel tank rather than the other way around. Twice the range. Any other merit of hydrogen combustion, you can beat with biofuels that are (comparatively) cheap to produce and far easier to distribute. Or just use fossil fuels directly. We don't know if there will ever be hydrogen fuel cells (giving you ten, twenty, thirty percent more percent range over combustion) that are power-dense enough to function; A few companies claim they've made advances but haven't brought anything to market.