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Originally Posted by phillyc
You've rather neatly forgotten that combusting petrol creates water vapour too... Loads of it.
For every 2 Petrol (C8H18) molecules you add 25 Oxygen (O2) & the result is you get 16 Carbon Dioxide (C02) & 18 Water (H2O) & 10.86MJ of energy.
Hydrogen will most likely be made the way it usually is now. Electrolysis. 2 water (H20) molecules are broken down into 2 Hydrogen (H2) & 1 Oxygen (O2). When Hydrogen is burned it then becomes H20. Back to where it started.
Yes energy is required to make it, to store it and transport. But petrol is not much different, but instead of making it, we drill for it.
Hydrogen is already one of the most common industrial gases anyway.
So, you perhaps should be more worried about water vapour from petrol. Besides it condenses in the end anyway. But yes, that newly formed water will have the ability to store heat.
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Actually, the overwhelming majority of current hydrogen production is by catalytically removing it from hydrocarbons...
The remaining carbon is either captured (if in CO2 form, which it may well be) or burried (solid form)