Whatever your opinion on the energy-capacity of Hydrogen... It still stands to reason you need the same amount of energy to fly a 747 load of people from X to Y. It's not as if using hydrogen means you don't need to expend the same number of joules.
So -- It doesn't matter if you use jet fuel, hydrogen or a rubber band -- the same amount of energy capacity needs to be airbourne.
That energy also has to be readily available (as it is for jet fuel or hydrogen)... So if an accident is going to happen, that energy is going to go somewhere (blast, fire, heat, whatever).
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Whatever your opinion on the energy-capacity of Hydrogen... It still stands to reason you need the same amount of energy to fly a 747 load of people from X to Y. It's not as if using hydrogen means you don't need to expend the same number of joules.
So -- It doesn't matter if you use jet fuel, hydrogen or a rubber band -- the same amount of energy capacity needs to be airbourne.
That energy also has to be readily available (as it is for jet fuel or hydrogen)... So if an accident is going to happen, that energy is going to go somewhere (blast, fire, heat, whatever).