In this study, we examined LCCO2, one of the representative indexes of environmental impact, as a starting point for analyzing the WEA scheme. The CO2 amount from transport construction/operation depends on the geographical condition of the supply destination, such as distance from the sea and the elevation. Thus, LCCO2 is a function of geographical constraints. Since inventory data, which are functions of these factors, have not been available, this study provided them first and examined LCCO2 with that data set. For the analysis, we chose arid/semi-arid regions where PV costs have dramatically dropped in recent years and where the demand for water and food is high, meaning the needs for WEF are large. We assumed that the desalination plant is constructed near the sea to dispose of concentrated seawater, and the ammonia synthesis plant is allocated near an inland city due to labor. The results showed that supplying PV power as electricity reduces LCCO2 the most. Using PV electricity, desalination reduces LCCO2 when cities are at lower elevations, and ammonia synthesis reduces LCCO2 when cities are at higher elevations. Besides, there are some cases in which desalination or ammonia synthesis increases LCCO2 depending on height. Finally, we report the geographical conditions and the ratio of the PV power allocation to water, electricity, and ammonia production that do not increase LCCO2.