I was reading the math on semi-trucks and charging times line up so well with union mandated breaks (at least one stop every so many hours of at least 30 minutes), I've got a feeling pure electric is going to work out well with semi-trucks (and maybe even something the unions will think a great overall win because it adds vehicular enforcement of union rules).

I still think hydrogen makes way more sense for ships at sea, maybe for planes (maybe not for dirigibles, though, hah), and probably as one of many "grid shifting" tools in the tool bag (converting excess wind/solar to hydrogen when it is cheap, and then reusing it at times of scarcity/grid outages/off-grid-festivals).

Though something was pointed out to me that while far down on the list of immediate greenhouse gas concerns, vastly expanding our production of Hydrogen and the amount that leaks into the atmosphere (and Hydrogen is so small we have no real good way to make a truly leak-proof container; long term storage of "hydrogen fuel" is a problem), it will have a lot of indirect impacts on greenhouse gases (including interrupting the chain process that converts most atmospheric methane to less harsh chemicals) and it's easy to forget that there are other greenhouse gas problems to worry about with respect to climate change beyond just "carbon footprint" and I know some scientists are increasingly of the angry opinion that Hydrogen was always a dangerous red herring distraction especially because while it reduces overall carbon output has enough secondary effects to worry about if it was a more common "fuel".