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Hi,
Hydrogen is a storage medium; not a fuel.
I think most of the loss is in the fuel cell turning H2 back into electricity. Recently MIT figured out a nearly 100% efficient way to make H2 from water.
I do not think that hydrogen is a greenhouse gas -- it disperses too quickly to contribute, I think. Methane is huge and of course carbon dioxide.
Storage is tough -- though the recent process to use chicken feathers (with their 8 angstrom hollow tubes!) to store hydrogen much less expensively makes this more plausible. I think hydrogen will need to be produced and stored and dispensed in a single location. Transporting it is very difficult.
Hydrogen cars will also need a battery or ultra-capacitor to store power from regenerative braking. So, I'm not sure that hydrogen can be as useful (or as efficient) as a battery EV, since they are essentially doing the same thing.
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