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ontains this total available water resource gives an idea of whether a country tends to experience physical water scarcity 34 this metric has a drawback because it is an average precipitation delivers water unevenly across the planet each year so annual renewable water resources vary from year to year this metric does not describe how easy it is for individuals households industries or government to access water lastly this metric gives a description of a whole country so it does not accurately portray whether a country is experiencing water scarcity for example canada and brazil both have very high levels of available water supply but they still face various water related problems 34 some tropical countries in asia and africa have low levels of freshwater resources more sophisticated indicators edit average ecological water scarcity at the provincial level in china 2016 2019 23 water scarcity assessments must include several types of information they include data on green water soil moisture water quality environmental flow requirements globalisation and virtual water trade 8 since the early 2000s water scarcity assessments have used more complex models these benefit from spatial analysis tools green blue water scarcity is one of these footprint based water scarcity assessment is another another is cumulative abstraction to demand ratio which considers temporal variations further examples are lca based water stress indicators and integrated water quantity quality environment flow 8 since the early 2010s assessments have looked at water scarcity from both quantity and quality perspectives 35 a successful assessment will bring together experts from several scientific discipline these include the hydrological water quality aquatic ecosystem science and social science communities 8 available water edit children fetch water from a muddy stream in a rural area during dry season the water is taken back home and undergoes filtration and other treatments before usage global use of freshwater 2016 fao data main articles water resources fresh water and water supply the united nations estimates that only 200 000 cubic kilometers of the total 1 4 billion cubic kilometers of water on earth is freshwater available for human consumption a mere 0 014 of all water on earth is both fresh and easily accessible 36 of the remaining water 97 is saline and a little less than 3 is difficult to access the fresh water available to us on the planet is around 1 of the total water on earth 37 the total amount of easily accessible freshwater on earth is 14 000 cubic kilometers this takes the form of surface water such as rivers and lakes or groundwater for example in aquifers of this total amount humanity uses and resuses just 5 000 cubic kilometers technically there is a sufficient amount of freshwater on a global scale so in theory there is more than enough freshwater available to meet the demands of the current world population of 8 billion people there is even enough to support population growth to 9 billion or more but unequal geographical distribution and unequal consumption of water makes it a scarce resource in some regions and groups of people rivers and lakes provide common surface sources of freshwater but other water resources such as groundwater and glaciers have become more developed sources of freshwater they have become the main source of clean water groundwater is water that has pooled below the surface of the earth it can provide a usable quantity of water through springs or wells these areas of groundwater are also known as aquifers it is becoming harder to use conventional sources because of pollution and climate change so people are drawing more and more on these other sources population growth is encouraging greater use of these types of water resources 34 scale edit current estimates edit in 2019 the world economic forum listed water scarcity as one of the largest global risks in terms of potential impact over the next decade 38 water scarcity can take several forms one is a failure to meet demand for water partially or totally other examples are economic competition for water quantity or quality disputes between users irreversible depletion of groundwater and negative impacts on the environment about half of the world s population currently experience severe water scarcity for at least some part of the year 39 half a billion people in the world face severe water scarcity all year round 5 half of the world s largest cities experience water scarcity 11 almost two billion people do not currently have access to clean drinking water 40 41 a study in 2016 calculated that the number of people suffering from water scarcity increased from 0 24 billion 14 of global population in 1906 to 3 8 billion 58 in 2004 according to united nations estimates from 2024 1 but eventually it increased further to 6 2 billion 75 of the global population in 2025 raising concerns of famine and instability 42 this study used two concepts to analyse water scarcity one is shortage or impacts due to low availability per capita the other is stress or impacts due to high consumption relative to availability future predictions edit girls of squatter settlement in dharan collect water from river in the 20th century water use has been growing at more than twice the rate of the population increase specifically water withdrawals are likely to rise by 50 percent by 2025 in developing countries and 18 per cent in developed countries 43 one continent for example africa has been predicted to have 75 to 250 million inhabitants lacking access to fresh water 44 by 2025 1 8 billion people will be living in countries or regions with absolute water scarcity and two thirds of the world population could be under stress conditions 45 by 2050 more than half of the world s population will live in water stressed areas and another billion may lack sufficient water mit researchers find 46 with the increase in global temperatures and an increase in water demand six out of ten people are at risk of being water stressed the drying out of wetlands globally at around 67 was a direct cause of a large number of people at risk of water stress as global demand for water increases and temperatures rise it is likely that two thirds of the population will live under water stress in 2025 47 37 191 according to a projection by the united nations by 2040 there can be about 4 5 billion people affected by a water crisis or water scarcity additionally with the increase in population there will be a demand for food and for the food output to match the population growth there would be an increased demand for water to irrigate crops 48 the world economic forum estimates that global water demand will surpass global supply by 40 by 2030 49 50 increasing the water demand as well as increasing the population results in a water crisis where there is not enough water to share in healthy levels the crises are not only due to quantity but quality also matters a study found that 6 20 of about 39 million groundwater wells are at high risk of running dry if local groundwater levels decline by a few meters in many areas and with possibly more than half of major aquifers 51 this would apply if they simply continue to decline 52 53 impacts edit see also water security water supply shortages edit see also wash a typical dry lakebed is seen in california which was experiencing its worst megadrought in 1 200 years as of 2022 precipitated by climate change and is therefore water rationing 54 controllable factors such as the management and distribution of the water supply can contribute to scarcity a 2006 united nations report focuses on issues of governance as the core of the water crisis the report noted that there is enough water for everyone it also said water insufficiency is often due to mismanagement corruption lack of appropriate institutions bureaucratic inertia and a shortage of investment in both human capacity and physical infrastructure 55 economists and others have argued that a lack of property rights government regulations and water subsidies have given rise to the situation with water these factors cause prices to be too low and consumption too high making a point for water privatization 56 57 58 the clean water crisis is an emerging global crisis affecting approximately 785 million people around the world 59 1 1 billion people lack access to water and 2 7 billion experience water scarcity at least one month in a year 2 4 billion people suffer from contaminated water and poor sanitation contamination of water can lead to deadly diarrheal diseases such as cholera and typhoid fever and other waterborne diseases these account for 80 of illnesses around the world 60 environment edit deforestation of the madagascar highland plateau has led to extensive siltation and unstable flows of western rivers using water for domestic food and industrial uses has major impacts on ecosystems in many parts of the world this can apply even to regions not considered water scarce 3 water scarcity damages the environment in many ways these include adverse effects on lakes rivers ponds wetlands and other fresh water resources thus results in water overuse because water is scarce this often occurs in areas of irrigation agriculture it can harm the environment in several ways this includes increased salinity nutrient pollution and the loss of floodplains and wetlands 25 61 water scarcity also makes it harder to use flow to rehabilitate urban streams 62 an abandoned ship in the former aral sea near aral kazakhstan through the last hundred years more than half of the earth s wetlands have been destroyed and have disappeared 9 these wetlands are important as the habitats of numerous creatures such as mammals birds fish amphibians and invertebrates they also support the growing of rice and other food crops and they provide water filtration and protection from storms and flooding freshwater lakes such as the aral sea in central asia have also suffered it was once the fourth largest freshwater lake in the world but it has lost more than 58 000 square km of area and vastly increased in salt concentration over the span of three decades 9 subsidence is another result of water scarcity the u s geological survey estimates that subsidence has affected more than 17 000 square miles in 45 u s states 80 percent of it due to groundwater usage 63 vegetation and wildlife need sufficient freshwater marshes bogs and riparian zones are more clearly dependent upon sustainable water supply forests and other upland ecosystems are equally at risk as water becomes less available in the case of wetlands a lot of ground has been simply taken from wildlife use to feed and house the expanding human population other areas have also suffered from a gradual fall in freshwater inflow as upstream water is diverted for human use potential for conflict edit other impacts include growing conflict between users and growing competition for water 17 6 examples for the potential for conflict from water scarcity include food insecurity in the middle east and north africa region 64 and regional conflicts over scarce water resources 65 causes and contributing factors edit population growth edit main article population growth around 1970s the common view was that water was an infinite resource at that time there were fewer than half the current number of people on the planet people were not as wealthy as today consumed fewer calories and ate less meat so less water was needed to produce their food they required a third of the volume of water we presently take from rivers today the competition for water resources is much more intense this is because there are now seven billion people on the planet and their consumption of water thirsty meat is rising and industry urbanization biofuel crops and water reliant food items are competing more and more for water in the future even more water will be needed to produce food because the earth s population is forecast to rise to 9 billion by 2050 66 in 2000 the world population was 6 2 billion the un estimates that by 2050 there will be an additional 3 5 billion people with most of the growth in developing countries that already suffer water stress 67 this will increase demand for water unless there are corresponding increases in water conservation and recycling 68 in building on the data presented here by the un the world bank 69 goes on to explain that access to water for producing food will be one of the main challenges in the decades to come it will be necessary to balance access to water with managing water in a sustainable way at the same time it will be necessary to take the impact of climate change and other environmental and social variables into account 70 in 60 of european cities with more than 100 000 people groundwater is being used at a faster rate than it can be replenished 71 over exploitation of groundwater edit main article groundwater pivot irrigation in saudi arabia april 1997 saudi arabia is suffering from a major depletion of the water in its underground aquifers 72 the increase in the number of people is increasing competition for water this is depleting many of the world s major aquifers it has two causes one is direct human consumption the other is agricultural irrigation millions of pumps of all sizes are currently extracting groundwater throughout the world irrigation in dry areas such as northern china nepal and india draws on groundwater and it is extracting groundwater at an unsustainable rate many cities have experienced aquifer drops of between 10 and 50 meters they include mexico city bangkok beijing chennai and shanghai 73 until recently groundwater was not a highly used resource in the 1960s more and more groundwater aquifers developed 74 improved knowledge technology and funding have made it possible to focus more on drawing water from groundwater resources instead of surface water these made the agricultural groundwater revolution possible they expanded the irrigation sector which made it possible to increase food production and development in rural areas 75 groundwater supplies nearly half of all drinking water in the world 76 the large volumes of water stored underground in most aquifers have a considerable buffer capacity this makes it possible to withdraw water during periods of drought or little rainfall 34 this is crucial for people that live in regions that cannot depend on precipitation or surface water for their only supplies it provides reliable access to water all year round as of 2010 the world s aggregated groundwater abstraction is estimated at 1 000 km 3 per year of this 67 goes on irrigation 22 on domestic purposes and 11 on industrial purposes 34 the top ten major consumers of abstracted water make up 72 of all abstracted water use worldwide they are india china united states of america pakistan iran bangladesh mexico saudi arabia indonesia and italy 34 goundwater sources are ...
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