Soil salinization (Aridity and wrong irrigation practices, sea level rise): Soil salinization is a global problem. More than 20% of the agricultural land in the world can no longer be used productively due to salinization. In all arid areas, agriculture is dependent on the possibilities of artificial irrigation. However, this means that the quality of the available irrigation water and its quantity are of decisive importance for the sustainability of the respective irrigation agriculture. This becomes particularly clear in the example of Egypt, which almost exclusively hangs “on the drip of the Nile”. In addition, in coastal lowlands there is the influence of seawater, which penetrates into the groundwater due to excessive water extraction from wells, and even more due to the global rise in sea level and the sinking of coastal plains.