I'm aware of the term, 'green hydrogen', which is in contrast to 'blue hydrogen' (or as I prefer to call it 'dirty hydrogen') which is a product of methane gas extraction and allows some of that methane to escape.
> but could be used for heating or for hydrogen cars.
I'm under the impression that hydrogen ICE vehicles at scale is impractical due to lack of infrastructure, safety issues etc, at least compared to batteries
Or potentially methanol (and better yet, butanol, which is easier to deal with than methanol, less corrosive, less hydroscopic).
Hydrogen, or zero net carbon hydrocarbons synthesized from it, is a good fit where energy density exceeds what current lithium chemistry batteries can provide, like aeroplanes, or rockets.