Pentium:

Last time I read about it, mass production of hydrogen was a big issue. The process is not green at all and also it consumes much more energy than the actual energy resulted/stored in the hydrogen produced...

That may be true if you were talking about power for the electrical grid, but is not relevant to energy needed for MOBILITY.   Society places a value on mobility in all forms, hence the lower efficiencies (which is true about fossil fuels too...) just becomes part of the cost of mobility - users will decide how much of it they can afford.  


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2017 Range Rover Sport S/C,  2009 Porsche 911S