Unsustainable use of freshwater resources worldwide creates enormous challenges for human societies populating these natural systems, and these challenges are likely to grow with climate change. Will societies respond with increased cooperation to manage freshwater resources more sustainably or will there be more conflict over this scarce but vital resource? This review of research on conflict and cooperation over transboundary freshwater resources shows that, thus far, the prevailing response is cooperation, albeit non-violent conflict is quite frequent, too. It also documents substantial progress in understanding the drivers of water-related cooperation and conflict. Key knowledge gaps remain, particularly with respect to transboundary water conflict and cooperation in the past 10 to 15 years and in terms of local water-related events. The key prerequisite for filling these gaps is that the research community engages in a joint effort to address persistent shortcomings in existing event datasets on water cooperation and conflict.
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IPCC Special Report on Global Warming of 1.5 °C (eds Masson-Delmotte, V. et al.) (WMO, 2018).
Grill, G. et al. Mapping the world’s free-flowing rivers. Nature 569, 215–221 (2019).
UNESCO World Water Assessment Programme The United Nations World Water Development Report 2019: Leaving No One Behind (UNESCO, 2019).
Weinzettel, J. & Pfister, S. International trade of global scarce water use in agriculture: Modeling on watershed level with monthly resolution. Ecol. Econ. 159, 301–311 (2019).
IPCC Climate Change 2014: Synthesis Report (eds Core Writing Team, Pachauri, R. K. & Meyer, L. A.) (IPCC, 2014).
Maavara, T. et al. Global phosphorus retention by river damming. Proc. Natl Acad. Sci. USA 112, 15603–15608 (2015).
Vörösmarty, C. J., Green, P., Salisbury, J. & Lammers, R. B. Global water resources: vulnerability from climate change and population growth. Science 289, 284–288 (2000).
Schewe, J. et al. Multimodel assessment of water scarcity under climate change. Proc. Natl Acad. Sci. USA 111, 3245–3250 (2014).
Arnell, N. W. & Gosling, S. N. The impacts of climate change on river flow regimes at the global scale. J. Hydrol. 486, 351–364 (2013).
Padowski, J. C., Gorelick, S. M., Thompson, B. H., Rozelle, S. & Fendorf, S. Assessment of human–natural system characteristics influencing global freshwater supply vulnerability. Environ. Res. Lett. 10, 104014 (2015).
Koubi, V. Climate change and conflict. Annu. Rev. Political Sci. 22, 343–360 (2019).
Koubi, V., Bernauer, T., Kalbhenn, A. & Spilker, G. Climate variability, economic growth, and civil conflict. J. Peace Res. 49, 113–127 (2012).
Wrathall, D. J., Van Den Hoek, J., Walters, A. & Devenish, A. Water Stress and Human Migration: A Global, Georeferenced Review of Empirical Research (Food and Agriculture Organization of the United Nations, 2018).
Mach, K. J. et al. Climate as a risk factor for armed conflict. Nature 571, 193–197 (2019).
De Stefano, L., Petersen-Perlman, J. D., Sproles, E. A., Eynard, J. & Wolf, A. T. Assessment of transboundary river basins for potential hydro-political tensions. Glob. Environ. Change 45, 35–46 (2017).
Beck, L., Bernauer, T., Siegfried, T. & Böhmelt, T. Implications of hydro-political dependency for international water cooperation and conflict: insights from new data. Political Geogr. 42, 23–33 (2014).
Bernauer, T. & Böhmelt, T. Basins at risk: predicting international river basin conflict and cooperation. Glob. Environ. Politics 14, 116–138 (2014).
De Stefano, L. et al. Mapping the Resilience of International River Basins to Future Climate Change-Induced Water Variability, Volume 2: Appendices (World Bank, 2010).
Milman, A., Bunclark, L., Conway, D. & Adger, W. N. Assessment of institutional capacity to adapt to climate change in transboundary river basins. Clim. Change 121, 755–770 (2013).
Dinar, A. & Tsur, Y. Management of Transboundary Water Resources Under Scarcity: A Multidisciplinary Approach (World Scientific, 2017).
McCracken, M. & Wolf, A. T. Updating the Register of International River Basins of the world. Int. J. Water Resour. Dev. 35, 732–782 (2019).
Weinzettel, J. & Pfister, S. International trade of global scarce water use in agriculture: modeling on watershed level with monthly resolution. Ecol. Econ. 159, 301–311 (2019).
Xie, L., Zhang, Y. & Panda, J. P. Mismatched diplomacy: China–India water relations over the Ganges–Brahmaputra–Meghna River Basin. J. Contemp. China 27, 32–46 (2018).
Zawahri, N. A. & Mitchell, S. M. Fragmented governance of international rivers: negotiating bilateral versus multilateral treaties. Int. Stud. Q. 55, 835–858 (2011).
Villar, P. C., Ribeiro, W. C. & Sant’Anna, F. M. Transboundary governance in the La Plata River basin: status and prospects. Water Int. 43, 978–995 (2018).
Böhmelt, T. et al. Demand, supply, and restraint: determinants of domestic water conflict and cooperation. Glob. Environ. Change 29, 337–348 (2014).
De Stefano, L., Edwards, P., De Silva, L. & Wolf, A. T. Tracking cooperation and conflict in international basins: historic and recent trends. Water Policy 12, 871–884 (2010).
Bernauer, T. & Kalbhenn, A. The Politics of International Freshwater Resource (Oxford Research Encyclopedia of International Studies, Oxford Univ. Press, 2010).
Hand, B. K. et al. A social–ecological perspective for riverscape management in the Columbia River Basin. Front. Ecol. Environ. 16, S23–S33 (2018).
Zhupankhan, A., Tussupova, K. & Berndtsson, R. Water in Kazakhstan, a key in Central Asian water management. Hydrolog. Sci. J. 63, 752–762 (2018).
Barua, A., Vij, S. & Zulfiqur Rahman, M. Powering or sharing water in the Brahmaputra River basin. Int. J. Water Resour. Dev. 34, 829–843 (2018).
Al-Saidi, M. Insights from negotiations models on water sharing conflicts in the development of water basin plans. IOP Conf. Ser.: Earth Environ. Sci. 191, 012004 (2018).
Barnes, J. The future of the Nile: climate change, land use, infrastructure management, and treaty negotiations in a transboundary river basin. Wiley Interdiscip. Rev. Clim. Change 8, e449 (2017).
Calhman, O. K. B. & da Hora, M. D. A. The Amazon Basin in the context of shared management of transboundary water resources. J. Water Resour. Prot. 9, 629–636 (2017).
Thomas, V. & Warner, J. Hydropolitics in the Harirud/Tejen river basin: Afghanistan as hydro-hegemon? Water Int. 40, 593–613 (2015).
Suhardiman, D., Giordano, M. & Molle, F. Scalar disconnect: the logic of transboundary water governance in the Mekong. Soc. Nat. Resour. 25, 572–586 (2012).
Siegfried, T. & Bernauer, T. Estimating the performance of international regulatory regimes: methodology and empirical application to international water management in the Naryn/Syr Darya basin. Water Resour. Res. 43, W11406 (2007).
Register of International River Basins (Oregon State University, 2018); https://go.nature.com/2tKI9WX
Kalbhenn, A. & Bernauer, T. International Water cooperation and conflict: A New Event Dataset (SSRN, 2012); https://doi.org/10.2139/ssrn.2176609
Gleditsch, N. P., Wallensteen, P., Eriksson, M., Sollenberg, M. & Strand, H. Armed conflict 1946–2001: a new dataset. J. Peace Res. 39, 615–637 (2002).
Palmer, G., D’Orazio, V., Kenwick, M. R. & McManus, R. W. Updating the militarized interstate dispute data: a response to Gibler, Miller, and Little. Int. Stud. Q. https://doi.org/10.1093/isq/sqz045 (2019).
Brochmann, M. & Gleditsch, N. P. Shared rivers and conflict–a reconsideration. Political Geogr. 31, 519–527 (2012).
Tir, J. & Stinnett, D. M. Weathering climate change: can institutions mitigate international water conflict? J. Peace Res. 49, 211–225 (2011).
Zawahri, N. & Michel, D. Assessing the Indus Waters Treaty from a comparative perspective. Water Int. 43, 696–712 (2018).
Brochmann, M. Signing river treaties—does it improve river cooperation? Int. Interact. 38, 141–163 (2012).
Schmeier, S. & Vogel, B. in Riverine Ecosystem Management (eds Schmutz, S. & Sendzimir, J.) 347–370 (Springer, 2018).
Giordano, M. et al. A review of the evolution and state of transboundary freshwater treaties. Int. Environ. Agreem.: Politics Law Econ. 14, 245–264 (2014).
Karreth, J. & Tir, J. International agreement design and the moderating role of domestic bureaucratic quality: the case of freshwater cooperation. J. Peace Res. 55, 460–475 (2018).
McClelland, C. World Event/Interaction Survey, 1966–1978. WEIS Codebook ICPSR, 5211 (ICPSR, 1978).
CAMEO Event Data Codebook (CAMEO, 2013); https://go.nature.com/37w3eCN
Open Event Data Alliance Software (OEDA, 2014); https://openeventdata.github.io/
BBC Monitoring (BBC, 2019); https://monitoring.bbc.co.uk/
Factiva (Dow Jones, 2019); https://professional.dowjones.com/factiva/
Ward, M. D., Greenhill, B. D. & Bakke, K. M. The perils of policy by p-value: predicting civil conflicts. J. Peace Res. 47, 363–375 (2010).
Yoffe, S. & Larson, K. Basins at Risk: Water Event Database Methodology. In Basins At Risk: Conflict and Cooperation Over International Freshwater Resources 6–41 PhD thesis, Oregon State Univ. (2002).
Yoffe, S., Wolf, A. T. & Giordano, M. Conflict and cooperation over international freshwater resources: indicators of basins at risk. J. Am. Water Resour. Assoc. 39, 1109–1126 (2003).
Hensel, P. R., McLaughlin Mitchell, S., Sowers, T. E. & Thyne, C. L. Bones of contention: comparing territorial, maritime, and river issues. J. Confl. Resolut. 52, 117–143 (2008).
Mitchell, S. M. & Zawahri, N. A. The effectiveness of treaty design in addressing water disputes. J. Peace Res. 52, 187–200 (2015).
Munia, H. et al. Water stress in global transboundary river basins: significance of upstream water use on downstream stress. Environ. Res. Lett. 11, 014002 (2016).
Wolf, A. T., Yoffe, S. B. & Giordano, M. International waters: identifying basins at risk. Water Policy 5, 29–60 (2003).
Yoffe, S. et al. Geography of international water conflict and cooperation: data sets and applications. Water Resour. Res. 40, W05S04 (2004).
Giordano, M. A. International River Basin Management: Global Principles and Basin Practice. PhD thesis, Oregon State Univ. (2002).
Kehl, J. R. Hydropolitical complexes and asymmetrical power: conflict, cooperation, and governance of international river systems. J. World-Syst. Res. 17, 218–235 (2011).
Rai, S. P., Sharma, N. & Lohani, A. K. Risk assessment for transboundary rivers using fuzzy synthetic evaluation technique. J. Hydrol. 519, 1551–1559 (2014).
Rai, S. P., Wolf, A. T., Sharma, N. & Tiwari, H. in River System Analysis and Management (ed. Sharma, N.) 353–368 (Springer, 2017).
Petersen-Perlman, J. D., Veilleux, J. C. & Wolf, A. T. International water conflict and cooperation: challenges and opportunities. Water Int. 42, 105–120 (2017).
Blankespoor, B., Dinar, S., Dinar, A. & Kulukurasuriya, P. The Impact of Water Supply Variability on Treaty Cooperation Between International Bilateral River Basin Riparian States (The World Bank, 2010).
Zeitoun, M., Mirumachi, N. & Warner, J. Transboundary water interaction II: soft power underlying conflict and cooperation. Int. Environ. Agreem. 11, 159–178 (2011).
Tir, J. & Stinnett, D. M. The institutional design of riparian treaties: the role of river issues. J. Confl. Resolut. 55, 606–631 (2012).
Dinar, S., Katz, D., De Stefano, L. & Blankespoor, B. Do treaties matter? Climate change, water variability, and cooperation along transboundary river basins. Political Geogr. 69, 162–172 (2019).
Dinar, A., De Stefano, L., Nigatu, G. & Zawahri, N. Why are there so few basin-wide treaties? Economics and politics of coalition formation in multilateral international river basins. Water Int. 44, 463–485 (2019).
Kalbhenn, A. Liberal peace and shared resources–a fair-weather phenomenon? J. Peace Res. 48, 715–735 (2011).
Wolf, A. T., Natharius, J. A., Danielson, J. J., Ward, B. S. & Pender, J. K. International river basins of the world. Int. J. Water Resour. Dev. 15, 387–427 (1999).
Wolf, A. T., Stahl, K. & Macomber, M. F. Conflict and cooperation within international river basins: the importance of institutional capacity. Water Resour. Upd. 125, 31–40 (2003).
Farinosi, F. et al. An innovative approach to the assessment of hydro-political risk: a spatially explicit, data driven indicator of hydro-political issues. Glob. Environ. Change 52, 286–313 (2018).
De Stefano, L. et al. Climate change and the institutional resilience of international river basins. J. Peace Res. 49, 193–209 (2012).
Petersen‐Perlman, J. D. & Wolf, A. T. Getting to the first handshake: enhancing security by initiating cooperation in transboundary river basins. J. Am. Water Resour. Assoc. 51, 1688–1707 (2015).
Subramanian, A., Brown, B. & Wolf, A. Reaching Across the Waters: Facing the Risks of Cooperation in International Waters (The World Bank, 2012).
Moran, E. F., Lopez, M. C., Moore, N., Müller, N. & Hyndman, D. W. Sustainable hydropower in the 21st century. Proc. Natl Acad. Sci. USA 115, 11891–11898 (2018).
Methodology (Water Peace and Security Partnership, 2020); https://waterpeacesecurity.org/info/methodology
The authors declare no competing interests.
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Bernauer, T., Böhmelt, T. International conflict and cooperation over freshwater resources. Nat Sustain 3, 350–356 (2020). https://doi.org/10.1038/s41893-020-0479-8
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