“Hydrogen gas is a low-carbon fuel cur ...
As a matter of fact, it is a no-carbon fuel.
On a related subject, the propane people are running TV commercials referring to propane as ‘green’. I have no complaint with propane but it’s not as green as natural gas.
If I remember my chemistry propane is C3H8 and nat gas is C2H4
Hydro or nuclear power could be nice source for green hydrogen in large quantities.
I believe Plug Power is building a large hydrogen production facility in up-state NY using hydro power to make it green.