Whether storing hydrogen on the vehicle as a gas in a pressure vessel, or as a liquid in a cryo pressure vessel, neither is trivial and in either case the tank will be quite a bit larger and heavier than batteries or a gas tank typically. The lack of a hydrogen infrastructure is another issue. Then there are safety issues, just as there are with gasoline or lithium batteries. Safety issues for those riding in hydrogen power vehicles are far from trivial if a vehicle is involved in an accident and are also striking for first responder EMTs and Firefighters
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