Is there any other kind?
I’m sure hunter has the ‘dirty’ kind.
Hydrogen as a fuel for road vehicles only makes sense if electricity is cheap and very abundant. And the way to abundant, cheap electricity is by application of new and much more safe Small Modular Nuclear reactors, several designs of which are all ready for introduction and widespread use. These units could be built in a factory and moved to location by rail car or semi-trailer trucks, and assembled on site, within WEEKS, rather than years.
https://www.westinghousenuclear.com/energy-systems/ap300-smr
“Is there any other kind?”
The icky kind that they extract from methane. That is to say, most of it.
Indeed Biden was at the lower end of his classes for a reason.