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When we talk hydrogen powered it's important to distinguish between hydrogen fuel cell vehicles where the fuel cell basically replaces the lithium battery in an electric vehicle and vehicles that burn hydrogen in an internal combustion engine.
The latter still produces harmful NOx emissions as part of the combustion process unless the power output of the engine is reduced to a level far below that of a comparable fossil fueled car (roughly half).
The biggest issue with hydrogen is the amount of energy it takes to produce the stuff in the first place plus the usual storage and transport problems.
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