Then it's merely reducing the "tax" until it is no longer an issue. A combination of efficiency improvements and lower source energy cost can solve this. The a

Then it's merely reducing the "tax" until it is no longer an issue. A combination of efficiency improvements and lower source energy cost can solve this. The alternatives have their own downsides. Usually in the form of weight or raw material usage. Since the raw material of hydrogen is water, this could easily be much cheaper than the competition.