Unfortunately, "spills" are still a big concern, especially if we used this as an energy medium in the grand scheme. This article states that hydrogen gas has around 11x the greenhouse potential compared to carbon dioxide. Also, as far as safety goes, you can't visually see a hydrogen fire without thermoptic equipment, so that could make cleanup more difficult.
I used to be really on board with hydrogen and fuel cells but there seems to be more issues that haven't been solved that make this impractical. As far as getting solar generated electricity out of the Sahara, your best bet is to convert to high voltage AC or to move production to the source.
Not to dissuade anyone from thinking that California is a much better state than Alabama; but those rankings are terrible. Florida ranked #2 best state in education, #1 in economy, and #13th in crime? Yeah, that's not biased at all USNews.