Re: Hydrogen .... Believe it or not.
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Hydrogen is an extremely difficult material to deal with. To store in any decent quantity, you have to either compress it to ridiculous pressures or cool it to near absolute zero. In both cases there are problems- boiling for the cryogenic liquid or permeation for the compressed gas. Additionally, energy per unit volume of hydrogen is very low in comparison to hydrocarbon fuels we're used to- Wikipedia says liquid hydrogen has even less mass of hydrogen in it per volume than typical liquid hydrocarbons.
To put it in perspective- look at the volume fuel tanks carried by the Aston Martin Hydrogen Rapide that competed at the Nurburgring 24H this year- massive storage volume and it only held about 3.5kg, enough for about two laps.
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