Re: ero emissions?
"And that's the part which is most problematic."
No, not really. First off, the tank pressure is said to be lower than usual, around 350bar. Second, scuba tanks are routinely pressurised at similar pressure and have a life of hunderds of thousands of cycles. Third, yes I do understand that air / nitrogen / helium etc. is not the same thing as hydrogen and specific care has to be taken in the choice and engineering of the material used, but declaring that "problematic" sounds a bit loaded.