The BIGGEST problem with clean energy

When it comes to Hydrogen, isn't there quite the storage and transportation problem? A friend of mine's PHD thesis was on making carbon fiber (light) Hydrogen tanks that didn't leak (tiny H-molecules have a way of seeping through material).
That's when I learned about another technique that doesn't just use Hydrogen but also Nitrogen from the air to create ammonia.
It works in a similar way as a Hydrogen cell (atoms go through membranes and catalyzers induce the reacions) but the main advantage is that there is already a (huge) network for ammonia transportation, it doesn't have to be stored at huge pressures, and it's less flamable/explosive... I do think the fact that you have to "break" a very stabe N2-molecule was sort of an issue still, but I found it a very interesting technique!