It takes considerable energy to decompose NH3. There is net energy release after you get it decomposted by oxidizing the decomposition products, especially the H2 -> H2O reaction. At certain times of the year, tons of NH3 are spread on farms by their owners each day in the USA. That agricultural use is the main market for NH3 in the USA, I think. Yes, NH3 is toxic, but it has such a strong smell that one would leave the area, if a small leak were to develope. Farmers spread it in an water solution, I think. Although one could add energy to each molecule by hitting pure NH3 liquid (which would not be liquid unless inside a presure containiner) I strongly doubt that the energy per molecule possible this way would be even half that necessary to decompose a molecule. You do not seem to understand that the decomposition REQUIRES input of energy. I.e. is an endothermic process. I know little chemisty, but of that I am sure. Can you support ANY of your statements? I bet less than half are correct.