Re: hydrogen as a fuel is absolutely rubbish.
"1kg of H2 (and thus 4kg of CO2 from the steam reformation process)"
How could you possibly get more energy from a given amount of natural gas (and so given amount of carbon emission) by extracting and only using the hydrogen? You are limited to a fuel cell and electric motor being more efficient than an ICE burning the gas and they are but not enough to overcome inefficiency of hydrogen production, storage, and transport.
The reforming process produces 4 x H2 and 1 x CO2 with molecular weights of 2 and 44 which makes 5.5kg of CO2 per kg of H. Additionally you need burn about half as much natural gas again to provide heat for the reaction bringing it up to 8.25kg/kg.
Then compression or liquefaction (which is probably how it would be moved around) needs about another 3 kWh of energy per kg and another 1.5kg of CO2 emission if you do with with UK generated electricity.
Biting the hand that feeds IT
