Lack of fresh water resources to meet water demand
Map of global water stress (a symptom of water scarcity) in 2019. Water stress is the ratio of water use relative to water availability and is therefore a demand-driven scarcity.[1]
Water scarcity (closely related to water stress or water crisis) is the lack of fresh water resources to meet the standard water demand. There are two type of water scarcity namely physical and economic water scarcity.[2]: 560 Physical water scarcity is where there is not enough water to meet all demands, including that needed for ecosystems to function. Arid areas for example Central Asia, West Asia, and North Africa often experience physical water scarcity.[3] Economic water scarcity on the other hand, is the result of lack of investment in infrastructure or technology to draw water from rivers, aquifers, or other water sources. It also results from weak human capacity to meet water demand.[2]: 560 Much of Sub-Saharan Africa experiences economic water scarcity.[4]: 11
There is enough freshwater available globally and averaged over the year to meet demand. As such, water scarcity is caused by a mismatch between when and where people need water, and when and where it is available.[5] The main drivers of the increase in global water demand are the increasing world population, rise in living conditions, changing diets (to more animal products),[6] and expansion of irrigated agriculture.[7][8] Climate change (including droughts or floods), deforestation, water pollution and wasteful use of water can also cause insufficient water supply.[9] Scarcity varies over time as a result of natural variability in hydrology. These variations in scarcity may also be a function of prevailing economic policy and planning approaches.
Water scarcity assessments need to incorporate information on green water (soil moisture), water quality, environmental flow requirements, globalization, and virtual water trade.[6] There is a need for collaboration between hydrological, water quality, aquatic ecosystem science and social science communities in water scarcity assessment.[6] "Water stress" has been used as parameter to measure water scarcity, for example in the context of Sustainable Development Goal 6.[10] Half a billion people live in areas with severe water scarcity throughout the year,[5][6] and around four billion people face severe water scarcity at least one month per year.[5][11] Half of the world's largest cities experience water scarcity.[11] There are 2.3 billion people who reside in nations with water scarcities, which means that each individual receives less than 1700 m3 of water annually. However, 380 billion m3 of municipal wastewater are produced globally each year.[12][13][14]
Reducing water scarcity requires supply and demand side management, cooperation between countries and water conservation (including prevention of water pollution). It also requires expanding sources of usable water (through wastewater reuse or desalination) and virtual water trade.
^Cite error: The named reference :15 was invoked but never defined (see the help page).
^ abCaretta, M.A., A. Mukherji, M. Arfanuzzaman, R.A. Betts, A. Gelfan, Y. Hirabayashi, T.K. Lissner, J. Liu, E. Lopez Gunn, R. Morgan, S. Mwanga, and S. Supratid, 2022: Chapter 4: Water. In: Climate Change 2022: Impacts, Adaptation and Vulnerability. Contribution of Working Group II to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change [H.-O. Pörtner, D.C. Roberts, M. Tignor, E.S. Poloczanska, K. Mintenbeck, A. Alegría, M. Craig, S. Langsdorf, S. Löschke, V. Möller, A. Okem, B. Rama (eds.)]. Cambridge University Press, Cambridge, UK and New York, NY, USA, pp. 551–712, doi:10.1017/9781009325844.006.
^Rijsberman, Frank R. (2006). "Water scarcity: Fact or fiction?". Agricultural Water Management. 80 (1–3): 5–22. Bibcode:2006AgWM...80....5R. doi:10.1016/j.agwat.2005.07.001.
^IWMI (2007) Water for Food, Water for Life: A Comprehensive Assessment of Water Management in Agriculture. London: Earthscan, and Colombo: International Water Management Institute.
^ abcMekonnen, Mesfin M.; Hoekstra, Arjen Y. (2016). "Four billion people facing severe water scarcity". Science Water Stress Advances. 2 (2): e1500323. Bibcode:2016SciA....2E0323M. doi:10.1126/sciadv.1500323. ISSN 2375-2548. PMC 4758739. PMID 26933676.
^ abcdLiu, Junguo; Yang, Hong; Gosling, Simon N.; Kummu, Matti; Flörke, Martina; Pfister, Stephan; Hanasaki, Naota; Wada, Yoshihide; Zhang, Xinxin; Zheng, Chunmiao; Alcamo, Joseph (2017). "Water scarcity assessments in the past, present, and future: Review on Water Scarcity Assessment". Earth's Future. 5 (6): 545–559. doi:10.1002/2016EF000518. PMC 6204262. PMID 30377623.
^Vorosmarty, C. J. (14 July 2000). "Global Water Resources: Vulnerability from Climate Change and Population Growth". Science. 289 (5477): 284–288. Bibcode:2000Sci...289..284V. doi:10.1126/science.289.5477.284. PMID 10894773. S2CID 37062764.
^Ercin, A. Ertug; Hoekstra, Arjen Y. (2014). "Water footprint scenarios for 2050: A global analysis". Environment International. 64: 71–82. Bibcode:2014EnInt..64...71E. doi:10.1016/j.envint.2013.11.019. PMID 24374780.
^"Water Scarcity. Threats". WWF. 2013. Archived from the original on 21 October 2013. Retrieved 20 October 2013.
^Cite error: The named reference :172 was invoked but never defined (see the help page).
^ ab"How do we prevent today's water crisis becoming tomorrow's catastrophe?". World Economic Forum. 23 March 2017. Archived from the original on 30 December 2017. Retrieved 30 December 2017.
^"Wastewater resource recovery can fix water insecurity and cut carbon emissions". European Investment Bank. Retrieved 29 August 2022.
^"International Decade for Action 'Water for Life' 2005-2015. Focus Areas: Water scarcity". www.un.org. Retrieved 29 August 2022.
^"THE STATE OF THE WORLD'S LAND AND WATER RESOURCES FOR FOOD AND AGRICULTURE" (PDF).
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