Japan has huge deposits of methan hydrate on sea floors it wants to mine.https://de.wikipedia.org/wiki/Methanhydrat

And this is why hydrogen is on the shit list, all the roads lead to ever more mined carbs, blown into the atmosphere in one way or another. The roads to green hydrogen are riddled with conversions that make it economically unviable.

Its the equivalent of a addict switching from heroin injection to a fetanyl patch. Yes, the process is cleaner, less dangerous, but the longterm bad effects are still there.