Hydrogen is used to produce ammonia, not the other way around. There is no natural source of ammonia. The first link is all about the use of hydrogen. The third

Hydrogen is used to produce ammonia, not the other way around. There is no natural source of ammonia. The first link is all about the use of hydrogen. The third is about ammonia cracker which may be useful to transport ammonia and turn back into hydrogen. Most hydrogen is produced by steam reforming methane, called gray hydrogen.