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It happens once and is reusable forever. It’s a massive improvement.
Sure, and it's a good interim tech until we get things like hydrogen working better.
Dude hydrogen is a bait and switch. We’ve had hydrogen engine tech forever. As for the source, you CAN get it from water after putting in more energy into it than you get out of it, or you can just refine it from oil. Guess what the plan has always been?
Hydrogen is just a way to greenwash big oil.
there are modern ways of doing it they're pretty efficient from what I've been reading using natural gas and water or electrolysis but I'm no scientist so I'm not going to try to explain it here I think maybe you should look into some more modern methods than what you're talking about.
Natural gas is not green. Not even close. It’s just more convenient. Electrolysis cannot magically be made more efficient here either. It takes a certain amount of energy to break those chemical bonds and you can’t magically break those bonds using less energy. The amount of energy you get from burning that hydrogen is less than what you put in to break those bonds via electrolysis.
I actually do know what I’m talking about here.