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Plus the hydrogen has to be stored under high pressure, and is extremely flammable, so there are some inherent safety concerns.

Here is a classic quote from the article:



Why does it have to be something requiring shipping? Why not something that can be transmitted through our electrical system grid? We already have fuels that require shipping, and that is a very dirty and expensive problem.
I certainly don't want a high pressure explosive tank under my butt... oh wait, gasoline is also explosive. The other issue with high pressure hydrogen is that the molicule is very small and parking a hydrogen vehicle at the airport will result in an empty tank in a week or so.
 

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I believe that is only an issue if you are trying to store the hydrogen as a liquid. Only BMW does that and they claim they've solved the problem.
So great, when can I buy one and where can I fill up? It's all vaporware until they ship in numbers, nationwide, and there is a refueling station in every city. Until then, I give it a snowball's chance.
 
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