Unsolved:Water scarcity

From HandWiki
Short description: Lack of fresh water resources to meet water demand
Baseline water stress per region: the ratio of total annual water withdrawals to total available annual renewable supply, accounting for upstream consumptive use
Water stress per country
Global physical and economic water scarcity

Water scarcity is the lack of fresh water resources to meet water demand. It affects every continent and was listed in 2019 by the World Economic Forum as one of the largest global risks in terms of potential impact over the next decade.[1] It is manifested by partial or no satisfaction of expressed demand, economic competition for water quantity or quality, disputes between users, irreversible depletion of groundwater, and negative impacts on the environment.[2] Two-thirds of the global population (4 billion people) live under conditions of severe water scarcity at least 1 month of the year.[3][4][5][6] Half a billion people in the world face severe water scarcity all year round.[3] Half of the world’s largest cities experience water scarcity.[5]

A mere 0.014% of all water on Earth is both fresh and easily accessible. Of the remaining water, 97% is saline and a little less than 3% is hard to access. Technically, there is a sufficient amount of freshwater on a global scale. However, due to unequal distribution (exacerbated by climate change) resulting in some very wet and some very dry geographic locations, plus a sharp rise in global freshwater demand in recent decades driven by industry, humanity is facing a water crisis. Demand is expected to outstrip supply by 40% in 2030, if current trends continue.[5][7]

The essence of global water scarcity is the geographic and temporal mismatch between freshwater demand and availability.[8][9] The increasing world population, improving living standards, changing consumption patterns, and expansion of irrigated agriculture are the main driving forces for the rising global demand for water.[10][11] Climate change, such as altered weather-patterns (including droughts or floods), deforestation, increased pollution, green house gases, and wasteful use of water can cause insufficient supply.[12] At the global level and on an annual basis, enough freshwater is available to meet such demand, but spatial and temporal variations of water demand and availability are large, leading to (physical) water scarcity in several parts of the world during specific times of the year.[3] All causes of water scarcity are related to human interference with the water cycle. Scarcity varies over time as a result of natural hydrological variability, but varies even more so as a function of prevailing economic policy, planning and management approaches. Scarcity can be expected to intensify with most forms of economic development, but, if correctly identified, many of its causes can be predicted, avoided or mitigated.[2]

Some countries have already proven that decoupling water use from economic growth is possible. For example, in Australia, water consumption declined by 40% between 2001 and 2009 while the economy grew by more than 30%.[13] The International Resource Panel of the United Nations states that governments have tended to invest heavily in largely inefficient solutions: mega-projects like dams, canals, aqueducts, pipelines and water reservoirs, which are generally neither environmentally sustainable nor economically viable. The most cost-effective way of decoupling water use from economic growth, according to the scientific panel, is for governments to create holistic water management plans that take into account the entire water cycle: from source to distribution, economic use, treatment, recycling, reuse and return to the environment.[13]

Supply & demand

Global use of freshwater, 2016 FAO data
Global water consumption 1900-2025, by region, in billions m3 per year

The total amount of easily accessible freshwater on Earth, in the form of surface water (rivers and lakes) or groundwater (in aquifers, for example), is 14.000 cubic kilometres (nearly 3359 cubic miles). Of this total amount, 'just' 5.000 cubic kilometres are being used and reused by humanity. Hence, in theory, there is more than enough freshwater available to meet the demands of the current world population of more than 7 billion people, and even support population growth to 9 billion or more. Due to the unequal geographical distribution and especially the unequal consumption of water, however, it is a scarce resource in some parts of the world and for some parts of the population.[7]

Scarcity as a result of consumption is caused primarily by the extensive use of water in agriculture/livestock breeding and industry. People in developed countries generally use about 10 times more water daily than those in developing countries.[14] A large part of this is indirect use in water-intensive agricultural and industrial production processes of consumer goods, such as fruit, oil seed crops and cotton. Because many of these production chains have been globalised, a lot of water in developing countries is being used and polluted in order to produce goods destined for consumption in developed countries.[7]

Physical & economic scarcity

Water scarcity can result from two mechanisms:

  • physical (absolute) water scarcity
  • economic water scarcity

Physical water scarcity results from inadequate natural water resources to supply a region's demand, and economic water scarcity results from poor management of the sufficient available water resources. According to the United Nations Development Programme, the latter is found more often to be the cause of countries or regions experiencing water scarcity, as most countries or regions have enough water to meet household, industrial, agricultural, and environmental needs, but lack the means to provide it in an accessible manner.[15] Around one fifth of the world's population currently live in regions affected by Physical water scarcity, where there is inadequate water resources to meet a country's or regional demand, including the water needed to fulfill the demand of ecosystems to function effectively.[15] Arid regions frequently suffer from physical water scarcity. It also occurs where water seems abundant but where resources are over-committed, such as when there is over development of hydraulic infrastructure for irrigation. Symptoms of physical water scarcity include environmental degradation and declining groundwater as well as other forms of exploitation or overuse.[16]

Economic water scarcity is caused by a lack of investment in infrastructure or technology to draw water from rivers, aquifers or other water sources, or insufficient human capacity to satisfy the demand for water. One quarter of the world's population is affected by economic water scarcity. Economic water scarcity includes a lack of infrastructure, causing the people without reliable access to water to have to travel long distances to fetch water, that is often contaminated from rivers for domestic and agricultural uses. Large parts of Africa suffer from economic water scarcity; developing water infrastructure in those areas could therefore help to reduce poverty. Critical conditions often arise for economically poor and politically weak communities living in already dry environment. Consumption increases with GDP per capita in most developed countries the average amount is around 200–300 litres daily. In underdeveloped countries (e.g. African countries such as Mozambique), average daily water consumption per capita was below 10 L. This is against the backdrop of international organisations, which recommend a minimum of 20 L of water (not including the water needed for washing clothes), available at most 1 km from the household. Increased water consumption is correlated with increasing income, as measured by GDP per capita. In countries suffering from water shortages water is the subject of speculation.[17]

Human right to water

In Meatu district, Simiyu Region, Tanzania (Africa), water most often comes from open holes dug in the sand of dry riverbeds, and it is invariably contaminated. Many children are deprived of an education primarily due to this daily task.[18][19]

The United Nations Committee on Economic, Social and Cultural Rights established a foundation of five core attributes for water security. They declare that the human right to water entitles everyone to sufficient, safe, acceptable, physically accessible, and affordable water for personal and domestic use.[15]

Millennium Development Goals (MDG)

At the 2000 Millennium Summit, the United Nations addressed the effects of economic water scarcity by making increased access to safe drinking water an international development goal. During this time, they drafted the Millennium Development Goals and all 189 UN members agreed on eight goals. MDG 7 sets a target for reducing the proportion of the population without sustainable safe drinking water access by half by 2015. This would mean that more than 600 million people would gain access to a safe source of drinking water. In 2016, the Sustainable Development Goals replaced the Millennium Development Goals.

Effects on environment

Water scarcity has many negative impacts on the environment, such as adverse effects on lakes, rivers, ponds, wetlands and other fresh water resources. The resulting water overuse that is related to water scarcity, often located in areas of irrigation agriculture, harms the environment in several ways including increased salinity, nutrient pollution, and the loss of floodplains and wetlands.[15][20] Furthermore, water scarcity makes flow management in the rehabilitation of urban streams problematic.[21]

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.[12] These wetlands are important not only because they are the habitats of numerous inhabitants such as mammals, birds, fish, amphibians, and invertebrates, but they support the growing of rice and other food crops as well as provide water filtration and protection from storms and flooding. Freshwater lakes such as the Aral Sea in central Asia have also suffered. Once the fourth largest freshwater lake, it has lost more than 58,000 square km of area and vastly increased in salt concentration over the span of three decades.[12]

Subsidence, or the gradual sinking of landforms, 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. In some areas east of Houston, Texas the land has dropped by more than nine feet due to subsidence.[22] Brownwood, a subdivision near Baytown, Texas, was abandoned due to frequent flooding caused by subsidence and has since become part of the Baytown Nature Center.

Climate change

Aquifer draw down or over drafting and the pumping of fossil water increases the total amount of water within the hydrosphere subject to transpiration and evaporation processes, thereby causing accretion in water vapour and cloud cover, the primary absorbers of infrared radiation in the earth's atmosphere. Adding water to the system has a forcing effect on the whole earth system, an accurate estimate of which hydrogeological fact is yet to be quantified.

Depletion of freshwater resources

The Lake Chad has shrunk by 90% since the 1960s.[23]

Apart from the conventional surface water sources of freshwater such as rivers and lakes, other resources of freshwater such as groundwater and glaciers have become more developed sources of freshwater, becoming the main source of clean water. Groundwater is water that has pooled below the surface of the Earth and can provide a usable quantity of water through springs or wells. These areas where groundwater is collected are also known as aquifers. Glaciers provide freshwater in the form meltwater, or freshwater melted from snow or ice, that supply streams or springs as temperatures rise. More and more of these sources are being drawn upon as conventional sources' usability decreases due to factors such as pollution or disappearance due to climate changes. Human population growth is a significant contributing factor in the increasing use of these types of water resources.[24]

Groundwater

Until recent history, groundwater was not a highly utilized resource. In the 1960s, more and more groundwater aquifers developed.[clarification needed] Changes in knowledge, technology and funding have allowed for focused development into abstracting water from groundwater resources away from surface water resources. These changes allowed for progress in society such as the "agricultural groundwater revolution", expanding the irrigation sector allowing for increased food production and development in rural areas.[25] Groundwater supplies nearly half of all drinking water in the world.[26] The large volumes of water stored underground in most aquifers have a considerable buffer capacity allowing for water to be withdrawn during periods of drought or little rainfall.[24] This is crucial for people that live in regions that cannot depend on precipitation or surface water as a supply alone, instead providing reliable access to water all year round. As of 2010, the world's aggregated groundwater abstraction is estimated at approximately 1,000 km3 per year, with 67% used for irrigation, 22% used for domestic purposes and 11% used for industrial purposes.[24] The top ten major consumers of abstracted water (India, China, United States of America, Pakistan, Iran, Bangladesh, Mexico, Saudi Arabia, Indonesia, and Italy) make up 72% of all abstracted water use worldwide.[24] Groundwater has become crucial for the livelihoods and food security of 1.2 to 1.5 billion rural households in the poorer regions of Africa and Asia.[27]

Pivot irrigation in Saudi Arabia, April 1997. Saudi Arabia is suffering from a major depletion of the water in its underground aquifers.[28]

Although groundwater sources are quite prevalent, one major area of concern is the renewal rate or recharge rate of some groundwater sources. Extracting from groundwater sources that are non-renewable could lead to exhaustion if not properly monitored and managed.[29] Another concern of increased groundwater usage is the diminished water quality of the source over time. Reduction of natural outflows, decreasing stored volumes, declining water levels and water degradation are commonly observed in groundwater systems.[24] Groundwater depletion may result in many negative effects such as increased cost of groundwater pumping, induced salinity and other water quality changes, land subsidence, degraded springs and reduced baseflows. Human pollution is also harmful to this important resource.

To set up a big plant near a water abundant area, bottled water companies need to extract groundwater from a source at a rate more than the replenishment rate leading to the persistent decline in the groundwater levels. The groundwater is taken out, bottled, and then shipped all over the country or world and this water never goes back. When the water table depletes beyond a critical limit, bottling companies just move from that area leaving a grave water scarcity. Groundwater depletion impacts everyone and everything in the area that uses the water: farmers, businesses, animals, ecosystems, tourism and other users e.g. people reliant on a local well for potable water. Millions of gallons of water out of the ground leaves the water table depleted uniformly and not just in that area because the water table is connected across the landmass. Bottling Plants generate water scarcity and impact ecological balance. They lead to water stressed areas which bring in droughts.[30]

Glaciers

Glaciers are noted as a vital water source due to their contribution to stream flow. Rising global temperatures have noticeable effects on the rate at which glaciers melt, causing glaciers in general to shrink worldwide.[31] Although the meltwater from these glaciers is increasing the total water supply for the present, the disappearance of glaciers in the long term will diminish available water resources. Increased meltwater due to rising global temperatures can also have negative effects such as flooding of lakes and dams and globally catastrophic results.[32]

Measurement

In 2012 in Sindh, Pakistan a shortage of clean water led people to queue to collect it where available

Hydrologists today typically assess water scarcity by looking at the population-water equation. This is done by comparing the amount of total available water resources per year to the population of a country or region. A popular approach to measuring water scarcity has been to rank countries according to the amount of annual water resources available per person. For example, according to the Falkenmark Water Stress Indicator,[33] a country or region is said to experience "water stress" when annual water supplies drop below 1,700 cubic metres per person per year. At levels between 1,700 and 1,000 cubic metres per person per year, periodic or limited water shortages can be expected. When water supplies drop below 1,000 cubic metres per person per year, the country faces "water scarcity".[34] The United Nations' FAO states that by 2025, 1.9 billion people will live in countries or regions with absolute water scarcity, and two-thirds of the world population could be under stress conditions.[35] The World Bank adds that climate change could profoundly alter future patterns of both water availability and use, thereby increasing levels of water stress and insecurity, both at the global scale and in sectors that depend on water.[36]

Other ways of measuring water scarcity include examining the physical existence of water in nature, comparing nations with lower or higher volumes of water available for use. This method often fails to capture the accessibility of the water resource to the population that may need it. Others have related water availability to population.

Another measurement, calculated as part of a wider assessment of water management in 2007,[37] aimed to relate water availability to how the resource was actually used. It therefore divided water scarcity into 'physical' and 'economic'. Physical water scarcity is where there is not enough water to meet all demands, including that needed for ecosystems to function effectively. Arid regions frequently suffer from physical water scarcity. It also occurs where water seems abundant but where resources are over-committed, such as when there is overdevelopment of hydraulic infrastructure for irrigation. Symptoms of physical water scarcity include environmental degradation and declining groundwater. Water stress harms living things because every organism needs water to live.

Renewable freshwater resources

Renewable freshwater supply is a metric often used in conjunction when evaluating water scarcity. This metric is informative because it can describe the total available water resource each country contains. By knowing the total available water source, an idea can be gained about whether a country is prone to experiencing physical water scarcity. This metric has its faults in that it is an average; precipitation delivers water unevenly across the planet each year and annual renewable water resources vary from year to year. This metric also does not describe the accessibility of water to individuals, households, industries, or the government. Lastly, as this metric is a description of a whole country, it does not accurately portray whether a country is experiencing water scarcity. Canada and Brazil both have very high levels of available water supply, but still experience various water related problems.[24]

It can be observed that tropical countries in Asia and Africa have low availability of freshwater resources.

The following table displays the average annual renewable freshwater supply by country including both surface-water and groundwater supplies.[38] This table represents data from the UN FAO AQUASTAT, much of which are produced by modeling or estimation as opposed to actual measurements.

Water stress

GEO-2000 estimate for 2025, 25 African countries are expected to suffer from water shortage or water stress.[39]

The United Nations (UN) estimates that, of 1.4 billion cubic kilometers (1 quadrillion acre-feet) of water on Earth, just 200,000 cubic kilometers (162.1 billion acre-feet) represent fresh water available for human consumption.[40]

More than one in every six people in the world is water stressed, meaning that they do not have sufficient access to potable water.[15] Those that are water stressed make up 1.1 billion people in the world and are living in developing countries. According to the Falkenmark Water Stress Indicator,[33] a country or region is said to experience "water stress" when annual water supplies drop below 1,700 cubic metres per person per year. At levels between 1,700 and 1,000 cubic meters per person per year, periodic or limited water shortages can be expected. When a country is below 1,000 cubic meters per person per year, the country then faces water scarcity . In 2006, about 700 million people in 43 countries were living below the 1,700 cubic metres per person threshold.[15] Water stress is ever intensifying in regions such as China, India, and Sub-Saharan Africa, which contains the largest number of water stressed countries of any region with almost one fourth of the population living in a water stressed country.[15] The world's most water stressed region is the Middle East with averages of 1,200 cubic metres of water per person.[15] In China, more than 538 million people are living in a water-stressed region. Much of the water stressed population currently live in river basins where the usage of water resources greatly exceed the renewal of the water source.

Changes in climate

Another popular opinion is that the amount of available freshwater is decreasing because of climate change. Climate change has caused receding glaciers, reduced stream and river flow, and shrinking lakes and ponds. Many aquifers have been over-pumped and are not recharging quickly. Although the total fresh water supply is not used up, much has become polluted, salted, unsuitable or otherwise unavailable for drinking, industry and agriculture. To avoid a global water crisis, farmers will have to strive to increase productivity to meet growing demands for food, while industry and cities find ways to use water more efficiently.[41]

A New York Times article, "Southeast Drought Study Ties Water Shortage to Population, Not Global Warming", summarizes the findings of Columbia University researcher on the subject of the droughts in the American Southeast between 2005 and 2007. The findings published in the Journal of Climate say that the water shortages resulted from population size more than rainfall. Census figures show that Georgia’s population rose from 6.48 to 9.54 million between 1990 and 2007.[42] After studying data from weather instruments, computer models, and tree ring measurements, they found that the droughts were not unprecedented and result from normal climate patterns and random weather events. "Similar droughts unfolded over the last thousand years", the researchers wrote, "Regardless of climate change, they added, similar weather patterns can be expected regularly in the future, with similar results."[42] As the temperature increases, rainfall in the Southeast will increase but because of evaporation the area may get even drier. The researchers concluded with a statement saying that any rainfall comes from complicated internal processes in the atmosphere and are very hard to predict because of the large amount of variables.

Water crisis

When there is not enough potable water for a given population, the threat of a water crisis is realized.[43] The United Nations and other world organizations consider a variety of regions to have water crises of global concern.[44][45] Other organizations, such as the Food and Agriculture Organization, argue that there are no water crises in such places, but steps must still be taken to avoid one.[46]

Effects of water crisis

There are several principal manifestations of the water crisis.

  • Food security in the Middle East and North Africa Region [47]
  • Inadequate access to safe drinking water for about 885 million people[48]
  • Inadequate access to sanitation for 2.5 billion people,[49] which often leads to water pollution
  • Groundwater overdrafting (excessive use) leading to diminished agricultural yields[50]
  • Overuse and pollution of water resources harming biodiversity
  • Regional conflicts over scarce water resources sometimes resulting in warfare.[51]

Waterborne diseases caused by lack of sanitation and hygiene are one of the leading causes of death worldwide. For children under age five, waterborne diseases are a leading cause of death. According to the World Bank, 88 percent of all waterborne diseases are caused by unsafe drinking water, inadequate sanitation and poor hygiene.[52]

Water is the underlying tenuous balance of safe water supply, but controllable factors such as the management and distribution of the water supply itself contribute to further scarcity.

A 2006 United Nations report focuses on issues of governance as the core of the water crisis, saying "There is enough water for everyone" and "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".[53] Official data also shows a clear correlation between access to safe water and GDP per capita.[54]

It has also been claimed, primarily by economists, that the water situation has occurred because of a lack of property rights, government regulations and subsidies in the water sector, causing prices to be too low and consumption too high, making a point for water privatization.[55][56][57]

Vegetation and wildlife are fundamentally dependent upon adequate freshwater resources. Marshes, bogs and riparian zones are more obviously dependent upon sustainable water supply, but forests and other upland ecosystems are equally at risk of significant productivity changes as water availability is diminished. In the case of wetlands, considerable area has been simply taken from wildlife use to feed and house the expanding human population. But other areas have suffered reduced productivity from gradual diminishing of freshwater inflow, as upstream sources are diverted for human use. In seven states of the U.S. over 80 percent of all historic wetlands were filled by the 1980s, when Congress acted to create a "no net loss" of wetlands.

In Europe extensive loss of wetlands has also occurred with resulting loss of biodiversity. For example, many bogs in Scotland have been developed or diminished through human population expansion. One example is the Portlethen Moss in Aberdeenshire.

Deforestation of the Madagascar Highland Plateau has led to extensive siltation and unstable flows of western rivers.

On Madagascar 's highland plateau, a massive transformation occurred that eliminated virtually all the heavily forested vegetation in the period 1970 to 2000. The slash and burn agriculture eliminated about ten percent of the total country's native biomass and converted it to a barren wasteland. These effects were from overpopulation and the necessity to feed poor indigenous peoples, but the adverse effects included widespread gully erosion that in turn produced heavily silted rivers that "run red" decades after the deforestation. This eliminated a large amount of usable fresh water and also destroyed much of the riverine ecosystems of several large west-flowing rivers. Several fish species have been driven to the edge of extinction and some, such as the disturbed Tokios coral reef formations in the Indian Ocean, are effectively lost. In October 2008, Peter Brabeck-Letmathe, chairman and former chief executive of Nestlé, warned that the production of biofuels will further deplete the world's water supply.

Overview of regions suffering crisis impacts

There are many other countries of the world that are severely impacted with regard to human health and inadequate drinking water. The following is a partial list of some of the countries with significant populations (numerical population of affected population listed) whose only consumption is of contaminated water:[58]

  • Sudan (12.3 million)
  • Venezuela (5.0 million)
  • Ethiopia (2.7 million)
  • Tunisia (2.1 million)
  • Cuba (1.3 million)

Several world maps showing various aspects of the problem can be found in this graph article.[59]

South Asian woman carrying water on her head, 2016

Water deficits, which are already spurring heavy grain imports in numerous smaller countries, may soon do the same in larger countries, such as China and India .[60] The water tables are falling in scores of countries (including Northern China, the US, and India) due to widespread overpumping using powerful diesel and electric pumps. Other countries affected include Pakistan , Iran, and Mexico. This will eventually lead to water scarcity and cutbacks in grain harvest. Even with the overpumping of its aquifers, China is developing a grain deficit. When this happens, it will almost certainly drive grain prices upward. Most of the 3 billion people projected to be added worldwide by mid-century will be born in countries already experiencing water shortages. Unless population growth can be slowed quickly, it is feared that there may not be a practical non-violent or humane solution to the emerging world water shortage.[61][62]

After China and India, there is a second tier of smaller countries with large water deficits — Algeria, Egypt , Iran, Mexico, and Pakistan.

According to a UN climate report, the Himalayan glaciers that are the sources of Asia's biggest rivers – Ganges, Indus, Brahmaputra, Yangtze, Mekong, Salween and Yellow – could disappear by 2035 as temperatures rise.[63] It was later revealed that the source used by the UN climate report actually stated 2350, not 2035.[64] Approximately 2.4 billion people live in the drainage basin of the Himalayan rivers.[65] India, China, Pakistan, Bangladesh, Nepal and Myanmar could experience floods followed by droughts in coming decades. In India alone, the Ganges provides water for drinking and farming for more than 500 million people.[66][67][68] The west coast of North America, which gets much of its water from glaciers in mountain ranges such as the Rocky Mountains and Sierra Nevada, also would be affected.[69][70]

Folsom Lake reservoir during the drought in California in 2015.[71]

By far the largest part of Australia is desert or semi-arid lands commonly known as the outback. In June 2008 it became known that an expert panel had warned of long term, possibly irreversible, severe ecological damage for the whole Murray-Darling basin if it does not receive sufficient water by October.[72] Water restrictions are currently in place in many regions and cities of Australia in response to chronic shortages resulting from drought. The Australian of the year 2007, environmentalist Tim Flannery, predicted that unless it made drastic changes, Perth in Western Australia could become the world’s first ghost metropolis, an abandoned city with no more water to sustain its population.[73] However, Western Australia's dams reached 50% capacity for the first time since 2000 as of September 2009.[74] As a result, heavy rains brought forth positive results for the region.[74] Nonetheless, the following year, 2010, Perth suffered its second-driest winter on record[75] and the water corporation tightened water restrictions for spring.[76]

Another city facing a water crisis is Cape Town, South Africa. The government and scientists in the area were preparing for "day zero", meaning that the area was almost completely out of water.The government was hopeful that voluntary conservation efforts and environmental factors would increase the water supply in the reservoirs, but these things did not happen which increased the likelihood of the city running out of potable water. Scientists at the University of Cape Town are concerned because without a water source they are not able to conduct valuable medical research or clinical studies.[77] Day Zero was avoided and restrictions were lifted for residents, but conservation efforts are still in place with uncertainty in rainfall amounts.[78]

Corporations and water scarcity

Corporations pose a significant threat to clean and affordable water. Onondaga Lake, the most polluted lake in America, is an example of how threatening corporations can be. During the late 1800s, people began building near the lake for the beautiful scenery and natural water it provided. As the area began to develop, a sewage treatment plant was built as well as multiple industrial chemical plants.[79] Because of the lack of environmental protection controls, the industries began to dump waste and chemical byproducts into Onondaga Lake. This practice continued for years until the lake was closed to swimming in 1940 and closed to fishing in 1970.[80] It was not until 2015 when Onondaga was re-opened for swimming, but at a combined cost of “$1.1 billion in public and private money”.[79]

Wind and solar power such as this installation in a village in northwest Madagascar can make a difference in safe water supply.

Construction of wastewater treatment plants and reduction of groundwater overdrafting appear to be obvious solutions to the worldwide problem; however, a deeper look reveals more fundamental issues in play. Wastewater treatment is highly capital intensive, restricting access to this technology in some regions; furthermore the rapid increase in population of many countries makes this a race that is difficult to win. As if those factors are not daunting enough, one must consider the enormous costs and skill sets involved to maintain wastewater treatment plants even if they are successfully developed.

Reducing groundwater overdrafting is usually politically unpopular, and can have major economic impacts on farmers. Moreover, this strategy necessarily reduces crop output, something the world can ill-afford given the current population.

At more realistic levels, developing countries can strive to achieve primary wastewater treatment or secure septic systems, and carefully analyse wastewater outfall design to minimize impacts to drinking water and to ecosystems. Developed countries can not only share technology better, including cost-effective wastewater and water treatment systems but also in hydrological transport modeling. At the individual level, people in developed countries can look inward and reduce over consumption, which further strains worldwide water consumption. Both developed and developing countries can increase protection of ecosystems, especially wetlands and riparian zones. There measures will not only conserve biota, but also render more effective the natural water cycle flushing and transport that make water systems more healthy for humans.

A range of local, low-tech solutions are being pursued by a number of companies. These efforts center around the use of solar power to distill water at temperatures slightly beneath that at which water boils. By developing the capability to purify any available water source, local business models could be built around the new technologies, accelerating their uptake. For example, Bedouins from the town of Dahab in Egypt have installed Aqua Danial's Water Stellar, which uses a solar thermal collector measuring two square meters to distill from 40 to 60 liters per day from any local water source. This is five times more efficient than conventional stills and eliminates the need for polluting plastic PET bottles or transportation of water supply.[81]

Managing water crises

Cape Town water crisis warning

However, lack of cooperation may give rise to regional conflicts in many parts of the world, specially in the global south, largely because of the disputes regarding the availability, use and management of water.[51]

The key, therefore, lies in strong institutions and cooperation.[citation needed] The Indus River Commission and the 1960 Indus Water Treaty have survived two wars between India and Pakistan despite the two countries' mutual hostility, proving a successful mechanism in resolving conflicts by providing a framework for consultation, inspection and exchange of data. The Mekong Committee has functioned since 1957 and outlived the Vietnam War of 1955-1975. In contrast, regional instability results when countries lack institutions to co-operate in regional collaboration, like Egypt's plan for a high dam on the Nile. However, (As of 2019 ) no global institution supervises the management of trans-boundary water sources, and international co-operation has happened through ad hoc collaboration between agencies, like the Mekong Committee which formed due to an alliance between UNICEF and the US Bureau of Reclamation. Formation of strong international institutions seems[original research?] to provide a way forward – they encourage early intervention and management,[citation needed] avoiding costly dispute-resolution processes.

One common feature of almost all resolved disputes is that the negotiations had a "need-based" instead of a "right–based" paradigm. Irrigable lands, population, and technicalities of projects define "needs". The success of a need-based paradigm is reflected in the only water agreement ever negotiated in the Jordan River Basin, which focuses in needs not on rights of riparians. In the Indian subcontinent, the irrigation requirements of Bangladesh determine water allocations of the Ganges River.[citation needed] A need-based, regional approach focuses on satisfying individuals with their need of water, ensuring that minimum quantitative needs are met. It removes the conflict that arises when countries view the treaty from a national-interest point-of-view and move away from a zero-sum approach to a positive-sum, integrative approach that equitably allocates water and its benefits.[citation needed]

The Blue Peace framework developed by Strategic Foresight Group in partnership with the governments of Switzerland and Sweden offers a unique policy structure which promotes sustainable management of water resources combined with cooperation for peace. By making the most of shared water-resources through cooperation rather than mere allocation between countries, the chances for peace can increase.[82][need quotation to verify] The Blue Peace approach has proven effective in (for example) the Middle East[83][84] and the Nile basin.[85][86] NGOs like Water.org, There Is No Limit Foundation,[87] and Charity: Water are leading the way[citation needed] in providing access to clean water.

Solutions

Atmospheric water generator

Main page: Earth:Atmospheric water generator

Atmospheric water generators (AWG) are devices that extracts water from humid ambient air. Water vapor in the air can be extracted by condensation - cooling the air below its dew point, exposing the air to desiccants, or pressurizing the air.

Many atmospheric water generators operate in a manner very similar to that of a dehumidifier: air is passed over a cooled coil, causing water to condense..[88]

Some of its advantages are their low price, the absence of heavy metals and bacteria improving populations health and their versatility of use of air as source of water, without the need of a lake, river or ocean nearby.

Desalination machines

Main page: Engineering:Desalination

Desalination machines are designed to take away mineral components from saline water. More generally, desalination refers to the removal of salts and minerals from a target substance,[89]

See also

References

  1. ↑ "Global risks report 2019". World Economic Forum. https://www.weforum.org/reports/the-global-risks-report-2019. 
  2. ↑ 2.0 2.1 "Coping with water scarcity. An action framework for agriculture and food stress". Food and Agriculture Organization of the United Nations. 2012. http://www.fao.org/docrep/016/i3015e/i3015e.pdf. 
  3. ↑ 3.0 3.1 3.2 Hoekstra, A.Y.; Mekonnen, M.M. (12 February 2016). "Four billion people facing severe water scarcity". advances.sciencemag (American Association for the Advancement of Science). http://advances.sciencemag.org/content/advances/2/2/e1500323.full.pdf. Retrieved 30 December 2017. 
  4. ↑ "4 billion people face water shortages, scientists find". World Economic Forum. 17 February 2016. https://www.weforum.org/agenda/2016/02/4-billion-people-face-severe-water-scarcity-at-least-for-one-month-every-year/. 
  5. ↑ 5.0 5.1 5.2 "How do we prevent today's water crisis becoming tomorrow's catastrophe?". World Economic Forum. 23 March 2017. https://www.weforum.org/agenda/2017/03/building-freshwater-resilience-to-anticipate-and-address-water-crises/. 
  6. ↑ "Global Water Shortage Risk Is Worse Than Scientists Thought". Huffingtonpost.com. 15 February 2016. https://www.huffingtonpost.com/entry/water-scarcity-study_us_56c1ebc5e4b0b40245c72f5e. 
  7. ↑ 7.0 7.1 7.2 "Water, bron van ontwikkeling, macht en conflict". NCDO, Netherlands. 8 January 2012. http://www.ncdo.nl/sites/default/files/Globaliseringsreeks%203%20Water.pdf. 
  8. ↑ S. L. Postel, G. C. Daily, P. R. Ehrlich, Human appropriation of renewable fresh water. Science 271, 785–788 (1996).
  9. ↑ H. H. G. Savenije, Water scarcity indicators; the deception of the numbers. Physics and Chemistry of the Earth B 25, 199–204 (2000).
  10. ↑ C. J. Vörösmarty, P. Green, J. Salisbury, R. B. Lammers, Global water resources: Vulnerability from climate change and population growth. Science 289, 284–288 (2000)
  11. ↑ A. E. Ercin, A. Y. Hoekstra, Water footprint scenarios for 2050: A global analysis. Environment International 64, 71–82 (2014).
  12. ↑ 12.0 12.1 12.2 "Water Scarcity. Threats". WWF. 2013. http://worldwildlife.org/threats/water-scarcity. 
  13. ↑ 13.0 13.1 "Half the world to face severe water stress by 2030 unless water use is "decoupled" from economic growth, says International Resource Panel". UN Environment. 21 March 2016. https://www.unenvironment.org/news-and-stories/press-release/half-world-face-severe-water-stress-2030-unless-water-use-decoupled. 
  14. ↑ "Why fresh water shortages will cause the next great global crisis". The Guardian. 8 March 2015. https://www.theguardian.com/environment/2015/mar/08/how-water-shortages-lead-food-crises-conflicts. 
  15. ↑ 15.0 15.1 15.2 15.3 15.4 15.5 15.6 15.7 United Nations Development Programme (2006). Human Development Report 2006: Beyond Scarcity–Power, Poverty and the Global Water Crisis. Basingstoke, United Kingdom:Palgrave Macmillan.
  16. ↑ "Water scarcity, risk and vulnerability". http://hdr.undp.org/en/media/HDR_2006_Chapter_4.pdf. Retrieved 2 December 2014. 
  17. ↑ Prokurat, Sergiusz (2015). "Drought and water shortages in Asia as a threat and economic problem". Journal of Modern Science (Józefów): 235–250. http://yadda.icm.edu.pl/yadda/element/bwmeta1.element.desklight-95d2a7ec-8c5f-474d-84ed-8b8baed8f8c0/c/235_PDFsam_Joms_3_26_2015.pdf. Retrieved 5 August 2016. 
  18. ↑ Lack of safe water and sanitation in schools affects children’s learning – and their lives Unicef Published 5 April 2010. Retrieved 03 January 2018
  19. ↑ Impact of water scarcity on girls education The Citizen, Tanzania, Published 14 November 2017. Retrieved 03 January 2018
  20. ↑ "Water Scarcity Index – Vital Water Graphics". http://www.unep.org/dewa/vitalwater/article77.html. Retrieved 20 October 2013. 
  21. ↑ J.E. Lawrence; C.P.W. Pavia; S. Kaing; H.N. Bischel; R.G. Luthy; V.H. Resh (2014). "Recycled Water for Augmenting Urban Streams in Mediterranean-climate Regions: A Potential Approach for Riparian Ecosystem Enhancement". Hydrological Sciences Journal 59 (3–4): 488–501. doi:10.1080/02626667.2013.818221. 
  22. ↑ Texas Water Report: Going Deeper for the Solution Texas Comptroller of Public Accounts. Retrieved 2/10/14.
  23. ↑ "Lake Chad: Can the vanishing lake be saved?". BBC News. 31 March 2018. https://www.bbc.com/news/world-africa-43500314. 
  24. ↑ 24.0 24.1 24.2 24.3 24.4 24.5 WWAP (World Water Assessment Programme). 2012. The United Nations World Water Development Report 4: Managing Water under Uncertainty and Risk. Paris, UNESCO.
  25. ↑ Giordano, M. and Volholth, K. (ed.) 2007. The Agricultural Groundwater Revolution. Wallingford, UK, Centre for Agricultural Bioscience International (CABI).
  26. ↑ WWAP (World Water Assessment Programme). 2009. Water in a Changing World. World Water Development Report 3. Paris/London, UNESCO Publishing/Earthscan.
  27. ↑ Comprehensive Assessment of Water Management in Agriculture. 2007. Water for Food, Water for Life: A Comprehensive Assessment of Water Management in Agriculture. London/Colomb, Earthscan/International Water Management Institute
  28. ↑ "What California can learn from Saudi Arabia's water mystery". Reveal. 22 April 2015. https://www.revealnews.org/article/what-california-can-learn-from-saudi-arabias-water-mystery/. 
  29. ↑ Foster, S. and Loucks, D. 2006. Non-renewable Groundwater Resources. UNESCO-IHP Groundwater series No. 10. Paris, UNESCO.
  30. ↑ Gasson, Christopher. "Don't waste a drop". Mining Magazine. https://www.globalwaterintel.com/dont-waste-drop-water-mining/. Retrieved 30 August 2018. 
  31. ↑ Hewitt, K. 2005. The Karakoram Anomaly? Glacier expansion and the ‘elevation effect’, Karakoram Himalaya. Mountain Research and Development, Vol. 25, No. 4, pp. 332–40
  32. ↑ Hewitt, K., 1982. Natural Dams and Outburst Floods of the Karakoram Himalaya. Proceedings of the Symposium on Hydrological Aspects of Alpine and High Mountain Areas. International Association of Hydrological Sciences (IAHS) Publication No. 138. Wallingford, UK, IAHS Press.
  33. ↑ 33.0 33.1 Falkenmark and Lindh 1976, quoted in UNEP/WMO. "Climate Change 2001: Working Group II: Impacts, Adaptation and Vulnerability". UNEP. Archived from the original on 26 June 2015. https://web.archive.org/web/20150626113733/http://www.grida.no/climate/ipcc_tar/wg2/180.htm. Retrieved 3 February 2009. 
  34. ↑ Larsen, Samuel T. L.. "Lack of Freshwater Throughout the World". Evergreen State College. http://academic.evergreen.edu/g/grossmaz/LARSENST/. Retrieved 1 February 2009. 
  35. ↑ FAO Hot issues: Water scarcity. Fao.org. Retrieved on 27 August 2013.
  36. ↑ The World Bank, 2009 "Water and Climate Change: Understanding the Risks and Making Climate-Smart Investment Decisions". pp. 21–24. http://water.worldbank.org/water/publications/water-and-climate-change-understanding-risks-and-making-climate-smart-investment-decisi. Retrieved 24 October 2011. 
  37. ↑ Molden, D. (Ed). (2007) Water for food, Water for life: A Comprehensive Assessment of Water Management in Agriculture. Earthscan/IWMI.
  38. ↑ 38.0 38.1 "Total Renewable Freshwater Supply, by Country". http://www.worldwater.org/datav7/data_table_1_total_renewable_freshwater_supply_by_country.pdf. Retrieved 5 November 2013. 
  39. ↑ "GEO-2000 overview overview". http://www.unep.org/geo/GEO2000/pdfs/ov-e.pdf. Retrieved 22 September 2016. 
  40. ↑ Texas Water Report: Going Deeper for the Solution. Texas Comptroller of Public Accounts.
  41. ↑ Chartres, C. and Varma, S. Out of water. From Abundance to Scarcity and How to Solve the World’s Water Problems FT Press (USA), 2010
  42. ↑ 42.0 42.1 Dean, Cornelia (2 October 2009) Southeast Drought Study Ties Water Shortage to Population, Not Global Warming. NY Times.
  43. ↑ Freshwater: lifeblood of the planet. Peopleandplanet.net (11 November 2002). Retrieved on 27 August 2013.
  44. ↑ "World water crisis worsened by corruption, repression: UN report". Un.org. 20 February 2006. https://www.un.org/apps/news/story.asp?NewsID=17551&Cr=&Cr1. Retrieved 10 March 2011. 
  45. ↑ UN World Summit on Sustainable Development. Released by NRDC at the World Summit for Sustainable Development, 29 August 2002.
  46. ↑ "No global water crisis – but may developing countries will face water scarcity". FAO.org. 12 March 2003.
  47. ↑ Nouri, H.; Stokvis, B.; Galindo, A.; Blatchford, M.; Hoekstra, A.Y. (2019). "Water scarcity alleviation through water footprint reduction in agriculture: The effect of soil mulching and drip irrigation". Science of the Total Environment 653: 241–252. doi:10.1016/j.scitotenv.2018.10.311. PMID 30412869. Bibcode: 2019ScTEn.653..241N. 
  48. ↑ Progress in Drinking-water and Sanitation: special focus on sanitation. WHO/UNICEF Joint Monitoring Programme for Water Supply and Sanitation. 17 July 2008. p. 25. http://www.unicef.org/media/files/Joint_Monitoring_Report_-_17_July_2008.pdf. 
  49. ↑ "Updated Numbers: WHO-UNICEF JMP Report 2008". Unicef.org. http://www.unicef.org/media/media_44093.html. Retrieved 10 March 2011. 
  50. ↑ "Water is Life – Groundwater drawdown". Academic.evergreen.edu. http://academic.evergreen.edu/g/grossmaz/WORMKA/. Retrieved 10 March 2011. 
  51. ↑ 51.0 51.1 "The Coming Wars for Water". October 12, 2019. https://reportsyndication.news.blog/2019/10/12/the-coming-wars-for-water/. 
  52. ↑ "All About: Water and Health". CNN. 18 December 2007. http://edition.cnn.com/2007/WORLD/asiapcf/12/17/eco.about.water/. 
  53. ↑ Water, a shared responsibility. The United Nations World Water Development Report 2, 2006
  54. ↑ "Public Services". Gapminder video. http://www.gapminder.org/videos/gapcasts/gapcast-9-public-services/. 
  55. ↑ Segerfeldt, Fredrik (25 August 2005), "Private Water Saves Lives", Financial Times.
  56. ↑ Zetland, David (1 August 2008) "Running Out of Water". aguanomics.com
  57. ↑ Zetland, David (14 July 2008) "Water Crisis". aguanomics.com
  58. ↑ Safe Drinking Water. WHO/UNICEF Joint Monitoring Programme, 2001.
  59. ↑ Chenoweth, Jonathan (28 August 2008) "Looming water crisis simply a management problem". New Scientist, pp. 28–32.
  60. ↑ "India grows a grain crisis". Atimes.com. 21 July 2006. http://www.atimes.com/atimes/South_Asia/HG21Df01.html. Retrieved 10 March 2011. 
  61. ↑ Brown, Lester R. (27 September 2006). "Water Scarcity Crossing National Borders". Earth Policy Institute. Archived from the original on 2009-03-31. https://web.archive.org/web/20090331153400/http://www.earth-policy.org/Books/Seg/PB2ch03_ss6.htm. Retrieved 10 March 2011. 
  62. ↑ Brown, Lester R. (8 September 2002) Water Shortages May Cause Food Shortages. Greatlakesdirectory.org. Retrieved on 27 August 2013.
  63. ↑ "Vanishing Himalayan Glaciers Threaten a Billion". Planetark.com. 5 June 2007. http://www.planetark.com/dailynewsstory.cfm/newsid/42387/story.htm. Retrieved 10 March 2011. 
  64. ↑ Bagla, Pallava (5 December 2009). "Himalayan glaciers melting deadline 'a mistake'". BBC. http://news.bbc.co.uk/2/hi/south_asia/8387737.stm. Retrieved 12 December 2009. 
  65. ↑ Big melt threatens millions, says UN. peopleandplanet.net. 4 June 2007
  66. ↑ "Ganges, Indus may not survive: climatologists". Rediff.com. 31 December 2004. http://www.rediff.com/news/2007/jul/24indus.htm. Retrieved 10 March 2011. 
  67. ↑ "Glaciers melting at alarming speed". English.peopledaily.com.cn. 24 July 2007. http://english.peopledaily.com.cn/90001/90781/90879/6222327.html. Retrieved 10 March 2011. 
  68. ↑ Singh, Navin (10 November 2004). "Himalaya glaciers melt unnoticed". BBC News. http://news.bbc.co.uk/2/hi/science/nature/3998967.stm. Retrieved 10 March 2011. 
  69. ↑ "Glaciers Are Melting Faster Than Expected, UN Reports". Sciencedaily.com. 18 March 2008. https://www.sciencedaily.com/releases/2008/03/080317154235.htm. Retrieved 10 March 2011. 
  70. ↑ Schoch, Deborah (2 May 2008) Water shortage worst in decades, official says, Los Angeles Times.
  71. ↑ Alexander, Kurtis (19 May 2015). "California drought: People support water conservation, in theory". http://www.sfgate.com/bayarea/article/California-drought-People-support-water-6271681.php. 
  72. ↑ Bryant, Nick (18 June 2008). "Australian rivers 'face disaster'". BBC News. http://news.bbc.co.uk/2/hi/asia-pacific/7460492.stm. Retrieved 2 December 2011. 
  73. ↑ Ayre, Maggie (3 May 2007). "Metropolis strives to meet its thirst". BBC News. http://news.bbc.co.uk/2/hi/science/nature/6620919.stm. Retrieved 2 December 2011. 
  74. ↑ 74.0 74.1 "Dams at record levels". ABC News. 15 September 2009. http://www.abc.net.au/news/stories/2009/09/15/2686535.htm. Retrieved 25 September 2009. 
  75. ↑ "More winter blues as rainfall dries up". ABC News. 31 August 2010. http://www.abc.net.au/news/stories/2010/08/31/2998259.htm?site=perth. Retrieved 13 January 2011. 
  76. ↑ "Saving water in spring". Water corporation (Western Australia). 23 September 2010. Archived from the original on 23 February 2011. https://web.archive.org/web/20110223014312/http://watercorporation.com.au/m/media_detail.cfm?id=3656. Retrieved 13 January 2011. 
  77. ↑ "As Cape Town water crisis deepens, scientists prepare for 'Day Zero'". accounts.google.com. https://www.nature.com/articles/d41586-018-01134-x. 
  78. ↑ Browdie, Brian; Browdie, Brian. "Cape Town delayed Day Zero but South Africa's water woes aren't over". Quartz Africa. https://qz.com/africa/1525526/cape-towns-day-zero-water-shortage-fear-spreads-in-south-africa/. 
  79. ↑ 79.0 79.1 Weaver, Teri (Jan 29, 2014). "$100 million in NY, county money for Onondaga Lake project, officials say". https://www.syracuse.com/news/2014/01/30_million_for_onondaga_lake_development_part_of_xxxx_project_gov_andrew_cuomo_s.html. 
  80. ↑ Matthews, David A.; Effler, Steven W.; Matthews, Carol M. (November 2000). "Ammonia and Toxicity Criteria in Polluted Onondaga Lake, New York". Water Environment Research 72 (6): 731–741. doi:10.2175/106143000x138355. ISSN 1061-4303. 
  81. ↑ Mansfield, Barry (1 December 2012). "THE MAN WHO CAN CHANGE FIRE INTO WATER". easy Jet Traveler. http://www.barrymansfield.com/pdf/easyJet%20Traveller%20December%202012%20Egypt%20edition.pdf. 
  82. ↑ Turkish Review, March 2013
  83. ↑ "Strategic Foresight Group - Anticipating and Influencing Global Future". http://www.strategicforesight.com/publication_pdf/40595Blue+Peace_Middle+East.pdf. 
  84. ↑ eda.base.components.templates.base.accessKeys. Deza.admin.ch. Retrieved on 2015-11-24.
  85. ↑ "Strategic Foresight Group - Anticipating and Influencing Global Future". http://www.strategicforesight.com/publication_pdf/84153Blue+Peace+for+the+Nile.pdf. 
  86. ↑ "Blue Peace: New Solution for Averting Water Wars in the Nile Basin - Yahoo Finance". 28 September 2013. https://web.archive.org/web/20130928122750/http://finance.yahoo.com/news/blue-peace-solution-averting-water-040000860.html. 
  87. ↑ "There Is No Limit Foundation". http://www.thereisnolimitfoundation.org/. 
  88. ↑ Environmental Assessment of Air to Water Machines. International Journal of Life Cycle Assessment, 18:1149-1157.
  89. ↑ "Desalination" (definition), The American Heritage Science Dictionary, via dictionary.com. Retrieved August 19, 2007.

Further reading

External links




Retrieved from "https://handwiki.org/wiki/index.php?title=Unsolved:Water_scarcity&oldid=345547"