Fueling the car is the major problem. We just aren't on a path dependent on hydrogen. From my research plug-in hybrids look like they will be the next dominant technology personal transport technology. It aligns much easier with our current technological infrastructure.
Synthesizing hydrogen, transporting it and then building hydrogen fueling stations is way more costly than just building battery powered cars.
Hydrogen's cool and all but I personally think it's a pipe dream.
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