However, the PV electricity-derived synthesis method for ammonia is ineffective in reducing LCCO2 and is 0.53 kg-CO2/kg-NH3, 39% of the emission from the conventional synthesis: 1.33 kg-CO2/kg-NH3. It is because the existing synthesis directly utilizes fossil resources rather than electricity and is very energy efficient. Hence, to reduce CO2 emission, ammonia synthesis is not favorable rather than desalination at low altitudes.