I don't see efficiency as nearly problematic as most seem to make it out to be (as far as the physics goes). Estimates online roughly estimate that the amount

I don't see efficiency as nearly problematic as most seem to make it out to be (as far as the physics goes). Estimates online roughly estimate that the amount of power from the sun that strikes the Earth in an hour is more than the entire world consumes in an year. Capturing just 0.0001% of that power would cover our needs. And I don't the worse efficiency of hydrogen being problematic in that regards.. but I can understand arguments regarding the economics.