Hydrogen isn't a source of energy. It's a battery all the same.

There are efficient and inefficient ways to "charge" a battery. And as a result, there are efficient and inefficient batteries.

Lithium is easy and efficient to charge, but there's certainly environmental (and not to mention political and ethical) concerns around its mining and refinement.

Hydrogen is not. It does have a benefit of being a rather dense mechanism though. But storing and transporting it is a problem of itself due to how small hydrogen atoms are. There will always be leaks.