You are right about solar energy being pretty clean
(although the production of solar cells, and their dumping and/or recycling is not without waste).
But that is just the age-old discussion of which energy sources are best/worst/most-poluting/most-clean. Sure we can do more solar than we do. There are of course limits to how much of the planet we want to cover with solar collectors. And most locations on the planet (because of lighting conditions) are not even profitable.
This doesn't have much to do with H2, though. Think of it a a battery, rather than an energy source. It does not add any energy to our budget - it has to be charged from another source.
*And* this is not a left/right issue. It's physics. Some people get it (like Tom), some don't (like W).