Technology
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We don't have any "green" hydrogen source at the moment. Hydrogen generation, at the moment, still releases carbon.
Hydrogen "engines" are only ~40% efficient compared to, say, BEVs that are ~80% efficient.
we absolutely do have green hydrogen at the moment https://rmi.org/insight/chinas-green-hydrogen-new-era/
It's important to look, not only at the vehicle, but at the energy efficiency of the system as a whole.
Well-To-Wheel it's referred to as.
Gasoline: ~20%
Diesel: ~30%
H Fuel Cell: ~25%
BEV (fossil power): ~20%*
BEV (renewable): ~55%*
*BEV is highly dependent on energy source. Anwhere from ~20% WTW from natural gas power generation to 75% from roof-mounted solar.
Keep in mind this is a summary of a summary of a summary.
Sources:
Yup, that's the problem.