Summary In light of the targets set out by the Paris Climate Agreement and the global energy sector's ongoing transition from fossil fuels to renewables, the chemical industry is searching for innovative ways of reducing greenhouse gas emissions associated with the production of ammonia. To address this need, research and development is under way around the world to replace the century-old Haber-Bosch process for manufacturing ammonia from N 2 and H 2 , powered by renewable electricity. This involves replacing H 2 obtained from steam-reformed CH 4 to H 2 that is instead obtained from electrolyzed H 2 O. This transition will enable the changeover from the Haber-Bosch production of NH 3 to electrochemical, plasma chemical, thermochemical, and photochemical generation of NH 3 . If ammonia can eventually be produced directly from N 2 and H 2 O powered by just sunlight, at a technologically significant scale, efficiency, and cost, in a solar ammonia refinery, green ammonia can change the world!