How many emissions and pollutants came from refining the hydrogen and oxygen though?
https://en.wikipedia.org/wiki/Water-gas_shift_reaction
https://en.wikipedia.org/wiki/Steam_reforming
The days of hydrogen being an efficient storage medium for solar or nuclear energy through electrolysis are far in the future.
Elon Musk has promised to eventually fuel Starship with synthetic "green" methane. Green hydrogen is a much simpler problem, so if Blue Origin hasn't yet made that promise, it's quite likely they will soon.
Just so I can pencil this on my calendar, where does this fit on the timeline relative to full self-driving and the hyperloop?