Ammonium chloride is used in dry cells and as a flux in soldering.
Ammonium sulfate is used as a fertilizer.
Ammonium nitrate is used as a fertilizer and in high explosives.
Fertilizers are needed for food production. If we didn't have them, less food would be produced and the world would find it hard to feed all the people. That makes them important. I kind of think a lot of the things in the world are interconnected and so everything is important. I agree with thor about oxygen and carbon dioxide. The world would stop working immediately without these. We could survive without ammonium salts, but we'd be hungrier.
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