**5. Conclusions**

For these problems to be successfully solved, it is necessary to conduct additional research, implement new scientifically based approaches, and support the principles of integrated water resources management. Especially for the African and Asian continents, it is necessary to review the water security policy. Understanding and managing water availability and quality is crucial everywhere but especially in developing nations. Without first achieving a water-secure world, it will not be possible to achieve the United Nations Sustainable Development Goals 2030.

**Author Contributions:** Conceptualization, M.B.; Data curation: M.U.; Formal analysis: M.B.; Methodology: M.U.; Validation; M.N. and S.A.R.S.; Writing—Original draft: M.B.; Writing—Review and Editing, M.U. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research received no external funding.

**Institutional Review Board Statement:** Not applicable.

**Informed Consent Statement:** Not applicable.

**Data Availability Statement:** The data are available on suitable demand.

**Conflicts of Interest:** The authors declare no conflict of interest.
