because ammonia synthesis requires continuous operation and electricity to support it, as described in Section 2.2. The following three parameters involved in pipeline length, l, 𝐶 , CO2 emission from grid construction (𝐶 ) has the subsequent large impact. The three parameters essential in desalination (Ewater, η, and z) have minor effects on the LCCO2 emissions in ammonia synthesis. It is because the water amount required for ammonia synthesis per electricity is tiny (0.l%) compared to seawater desalination since most of the energy in ammonia synthesis is consumed in water electrolysis. Therefore, it can be said that the LCCO2 emissions related to the length of the pipeline are larger than the potential energy for ammonia synthesis. In other words, ammonia synthesis is advantageous for reducing CO2 emissions in cities at higher elevations.