However, as the electricity supply increases, LCCO2 emissions can be reduced even if more PV electricity is given to desalination. 40% of the electricity supplied is enough to reduce LCCO2 emissions no matter how allocated the remaining electricity is. Mexico City has already pumped water from wells as deep as 1900 m, 54 and then there is a possibility to be realized. In conclusion, even at a high altitude and distance from the coast, such as Mexico City, the WEA scheme can reduce LCCO2 emissions overall by adjusting the distribution of power supply sources with electricity, desalination, and ammonia synthesis. m. The desert below 0 m sea level is preferable in reducing LCCO2 emission because they can use the potential energy to transport water the other way round. These are favorable conditions for applying the WEA scheme.