Comment by pama

I think it is a good idea to slow down on hydrogen as a fuel for cars for a while, because, unfortunately, it does not work well within our modern civilization. Even tiny amounts of elemental hydrogen can cause serious corrosion on certain alloys and induce steel based buildings to become brittle and possibly fall into pieces. Because of hydrogen’s near quantum nature, it is mostly a matter of when, rather than if such a gas would ever escape and create troubles. So if the tech ever took off we’d need to rebuild huge chunks of our major cities in the world very quickly; certainly doable, but much more complicated than simply adding the missing fuel stations.