[orbsycli]

Also,

Grapefruit seed extract purifies water in just under a minute.

[Michaelangelica]

Does it?
I am told that a few drops of lemon juice to a cup will do the same.
althoug in some places it might be safer to drink the lemon juice

Just came accross this interesting article from Cosmos

The Water Services Association of Australia predicts that if no water conservation measures are taken, and climate change and population growth continue as forecast, Australia's 10 largest cities will - by 2030 - be consuming 854 gigalitres (GL) more water than they use.
That's a monumental increase in demand. To put it in perspective, that's nearly two times more water than the whole of Melbourne currently uses in a year.
Clearly, the driest inhabited continent in the world has a problem.
It's a perversely comforting thought that Australia is not alone it its predicament. Climate change is a worldwide phenomenon, uniting the human species - and every other living creature, whether they like it or not - in hardship. The United Nations describes the global water situation as a "crisis ... essentially caused by the ways in which we mismanage water". The U.N. is so concerned about water, it has named 2005 to 2015 as the Decade of Water.
According to the U.N., water use has risen six-fold in the past 100 years. We are now at the point where half of the world's wetlands have vanished, and 20 per cent of freshwater fish are endangered.

More than one sixth of the world's population, some 1.2 billion people, do not have enough clean water to drink every day.
It is estimated that 3.3 million people die as a result of drinking this untreated water every year.
But disease is not the worst of the world's water worries: running short is a far more pressing problem.
The U.N. forecasts that by 2050, between 2 billion and 7 billion human beings will be affected by chronic water shortages. Climate change will have a bearing, as will population growth and improving living standards, which leads to higher rates of consumption.
In an article for the U.N. Chronicle, Albert Schumacher, a Canadian physician, says: "China is an excellent illustration of the daunting water management challenge that we face in this century.
It has approximately 21 per cent of the global population, but access to only 7 per cent of the planet's fresh water. This situation is exacerbated by its rapid industrialisation, with millions of people migrating from the countryside to the cities, a greatly increased use of indoor plumbing and changing diets that include water-intensive foods like beef and pork."
It's when the water runs out that things really start to get ugly. Many analysts have forecast that wars in the future will not be fought over land, religion, or oil; it is water that will trigger conflict.
"Just as war over fire sparked conflict among early prehistoric tribes, wars over water may result from current tensions over this resource in the next few years," according to a 2001 report prepared by the consultancy PricewaterhouseCoopers. "The Near and Middle East are the zones where there is the greatest threat."
In 2002, U.N. Secretary-General Kofi Annan warned that "Fierce national competition over water resources has prompted fears that water issues contain the seeds of violent conflict." Since then, the U.N. has backed away from the suggestion of all-out warring over water, but maintains the situation is nonetheless grave.
In a report released to celebrate World Water Day 2006 (March 22), the U.N. said, "Conflicts occur, in particular, between users sharing the same resource - a situation often exacerbated by traditional values, customs and practices, historical factors and geographical vagaries."
Singapore is one country. . .

The water crisis | COSMOS magazine
There is lots more. It is an excellent article. Australians especially should read it
The water crisis | COSMOS magazine

[jungjedi]

i saw a report on FRONTLINE about this issue of scarecity of water and lack of proper sanitation leading to billions of people dying from the year 2020 to 2060.i recon wars will be raised in the middle east over this issue

[InfiniteNow]

Originally Posted by jungjedi

i saw a report on FRONTLINE about this issue of scarecity of water and lack of proper sanitation leading to billions of people dying from the year 2020 to 2060.i recon wars will be raised in the middle east over this issue

Of course. As we all know, the middle east is known for it's vast fresh water supply.

[jungjedi]

no,they were talking about fighting over what little there was

[Zythryn]

While I can see war breaking out over scarce resources, I don't think water will be the trigger in the middle east (oil maybe, but not water).

War is breaking out, at least in part, due to scarcity of water. This can be seen in darfur Take a look at lake Chad. 33 years ago it was the 6th largest lake in the world. Now it is almost gone. As the lake dries up, people come into conflict over the remaining water.

[Michaelangelica]

Originally Posted by jungjedi

no,they were talking about fighting over what little there was

Water and power is a problem in Jordan
"Water supplies are unevenly distributed around the globe," which is the point TBG was making?
A prof from Adelaide Uni says underground water is made underground. It does not come from above. He has just written abook about it. I will try to find the ref. and put it in "strange claims"?

More precious than oil, yet routinely wasted, water is arguably the world's most pressing resource issue.

Ensuring Water Supply
Human development depends on adequate water—a fact that has driven the location of communities, the extent of agriculture, and the shape of industry and transportation for centuries.

Because of its central place in our activities, water is also the focus of much engineering activity and investment in the form of dams, canals, pipelines, and irrigation systems.
Today, there are more than 45,000 large dams (dams more than 15 meters high) in the world—most of them built in the last 35 years (WCD 2000:8, 11). This storage capacity represents a 700 percent increase in the standing stock of water in river systems since 1950 (Vörösmarty et al. 1997:210).

The increase in storage capacity has permitted the expansion of agriculture through the use of irrigation, as well as the capability to distribute water more evenly throughout the year in many areas of the world where seasonal water shortages are a problem.
But water demand is growing quickly, jeopardizing the availability of the supplies we would like to collect, store and use.
Global water consumption rose sixfold between 1900 and 1995—more than double the rate of population growth—and continues to grow rapidly as agricultural, industrial, and domestic demand increases (WMO 1997:9).

Not surprisingly, the environmental impacts of our water consumption are growing rapidly as well. For example, the enormous increase in the number of dams has fragmented and seriously altered the flow of roughly 60 percent of the world's major river basins.
These fragmented rivers carry nearly 90 percent of the water flowing through these major basins (Revenga et al. 2000:17).
As population increases and freshwater systems are modified to a point where many of their basic functions are affected, it becomes increasingly difficult to ensure that there is enough water for both people and nature. (See related feature: Freshwater Biodiversity in Crisis.)

How Scarce is Water?
Humans now withdraw about 4,000 km³ of water a year—about 20 percent of the base flow (the average dry-weather flow) of the world's rivers (Shiklomanov 1997:14, 69).
Understanding what this means in terms of the global water cycle requires some context: scientists estimate that the average amount of global runoff (the amount of water that is available for human use after evaporation or absorption into groundwater aquifers) is between 39,500 km³ and 42,700 km³ a year (Fekete et al. 1999:31; Shiklomanov 1997:13).

However, not all of this water is available to humans. Much of the runoff occurs in flood events or is inaccessible to people because of its remote location.
In addition, part of the runoff needs to remain in waterways so that aquatic ecosystems continue to function. In fact, only around 9,000 km³ is readily accessible to humans every year as runoff. An additional 3,500 km³ is stored in reservoirs (WMO 1997:7).

In any case, such global averages fail to portray the details of the world's water situation.
Water supplies are unevenly distributed around the globe, with some areas containing abundant water and others a much more limited supply. For example, arid and semiarid regions receive only 2 percent of the world's runoff, even though they occupy roughly 40 percent of the terrestrial area (WMO 1997:7). In river basins with high water demand relative to the available runoff, water scarcity is a growing problem.

New estimates of water scarcity calculated by the World Resources Institute in collaboration with the University of New Hampshire show that some 41 percent of the world's population, or 2.3 billion people, live in river basins under "water stress," meaning that per capita water supply is less than 1,700 m³/year (see Figures 1 and 2). An area in "water stress" is subject to frequent water shortages.


In many of these areas, water supply is actually less than 1,000 m³ per capita. In these "highly stressed" river basins, the consequences of water scarcity can be much more severe, leading to problems with local food production and economic development unless the region is wealthy enough to apply new technologies for water use, conservation, or reuse. Some 1.7 billion people (out of the 2.3 billion noted above) live in such high water-stress basins.

Assuming that current water consumption patterns continue unabated, projections show that at least 3.5 billion people—or 48 percent of the world's projected population—will live in water-stressed river basins in 2025 (see Figure 2). Even regions where per capita water availability appears sufficient when averaged over the year may actually face water shortages in the dry season.


The results of this analysis make it clear that many of the most populous river basins will gradually slip into water stress (with water per capita falling below 1,700 m³ per year) over the next quarter century as water consumption rises.

Wasting Water: Inefficiency, Overuse, and Pollution
Global food production must increase in the years ahead to accommodate population growth. United Nations projections put global population at nearly 8 billion in 2025—up 1.7 billion from today (UNPD 2001:vi). This means the world's farmers will need more water for irrigation. Growth in food production in the last 50 years has been roughly matched by a proportional increase in water use, with grain yields rising 2.4-fold between 1950 and 1995 and irrigation water use rising 2.2-fold (Postel 1999:165). At present, irrigated agriculture accounts for 40 percent of global food production, even though it represents just 17 percent of global cropland (WMO 1997:9). As a consequence, agriculture is society's major user of water, withdrawing some 70 percent of all water (WMO 1997:8) (see Figure 3).


Unfortunately, most irrigation systems are relatively inefficient and result in massive water waste. Global estimates of irrigation efficiency show that around 60 percent of irrigation water never reaches the crop and is lost to evaporation and runoff (Postel 1993:56; Rosegrant 1997:4; Seckler et al. 1998:25).

Adding to the problem of inefficient irrigation techniques is the fact that farmers usually pay low prices for irrigation water, giving them little incentive to conserve. Government water subsidies that artificially lower water prices are the primary culprit. In the western United States, for example, water subsidies total some $2-2.5 billion per year. Throughout the world, government support typically allows water utilities to sell irrigation water for far less than the cost of supplying it. In arid Tunisia, farmers pay no more than one-seventh the cost of their water (de Moor and Calamai 1997:14-15). Such low prices and subsidies encourage inefficient use and discourage the adoption of water-saving technology like drip irrigation (Johnson et al. 2001:1072; Postel 1999:228-231).

Water pollution adds enormously to existing problems of local and regional water scarcity by removing large volumes of water from the available supply. In many parts of the world, rivers and lakes have become so polluted that their water is unfit even for industrial uses (WMO 1997:11; UNEP/GEMS 1995:6). (See related feature: Dirty Water: Pollution Problems Persist.)

Groundwater is Scarce, Too
Global concerns about water scarcity include not only surface water sources but groundwater sources. More than 1 billion people in Asian cities and 150 million in Latin American cities rely on groundwater from wells or springs (Foster et al. 1998:xi). In addition, although there are no complete figures on groundwater use by the rural population, many countries are increasingly dependent on this resource for both domestic and agricultural uses (Foster et al. 2000:1).

Currently humans withdraw approximately 600-700 km³ of groundwater per year—about 20 percent of global water withdrawals (Shiklomanov 1997:53-54).
Some of this water is fossil water (ancient water that isn't routinely replenished) that comes from deep sources isolated from the normal runoff cycle, but much groundwater comes from shallower aquifers that draw from the same global runoff that feeds freshwater ecosystems. Indeed, overdrafting of groundwater sources can rob streams and rivers of a significant fraction of their flow.
In the same way, pollution of aquifers by nitrates, pesticides, and industrial chemicals often affects water quality in adjacent freshwater ecosystems. Although overdrafting and contamination of groundwater aquifers are known to be widespread and growing problems (UNEP 1996:4-5), comprehensive data on groundwater resources and pollution trends are not available at the global level.

Wiser Management Means More Water
Better management of water resources is the key to mitigating water scarcities in the future and avoiding further damage to aquatic ecosystems. In the short term, more efficient use of water could dramatically expand available resources.
This is particularly true in the agricultural sector, where experience shows that drip irrigation systems routinely cut water use 30-70 percent, while simultaneously increasing crop yields 20-90 percent. Although the use of drip irrigation has grown more than 50-fold over the last 20 years, it is still used in only 1 percent of the world's irrigated areas (Postel 1999:174).

More efficient water technology alone will not be sufficient to fully address the looming water crisis. It will also require difficult policy choices that reallocate water to the most economically and socially beneficial use. This may mean diverting water from agriculture to commercial or household uses. In China, for example, planners estimate that a given amount of water used in industry generates more than 70 times more economic value than the same water used in agriculture (Postel 1999:114).

To a certain extent, the transfer of water from low-value uses to higher-value uses is already well under way, especially where individuals hold legal water rights that they can sell to others. Farmers outside the city of Tirupur in southern India, for example, have begun to abandon farming so that they can sell their groundwater at a premium to water-hungry industries and urban users (Postel 1999:114). Such "water markets"are becoming more common in arid regions of the western United States and Australia.

An important key to using and allocating water more efficiently is phasing out subsidies and allowing water prices to reflect the true cost of supply. Price reforms in Chile reduced irrigation water use 22-26 percent and saved $400 million in costs for developing new water supplies. In Bogor, Indonesia, price increases cut domestic consumption by 30 percent (Johnson et al. 2001:1072). However, effective water pricing, particularly of irrigation water, remains a highly sensitive issue in low-income countries, where agriculture still dominates the economy and most farmers have limited incomes.




Assuming that current water consumption patterns continue unabated, projections show that at least 3.5 billion people—or 48 percent of the world's projected population—will live in water-stressed river basins in 2025 (see Figure 2). Even regions where per capita water availability appears sufficient when averaged over the year may actually face water shortages in the dry season.

[freeztar]

Originally Posted by TheBigDog

I hope water becomes as valuable as oil. Seeing how I live on Lake Erie, one of the largest fresh water lakes in the world, I will be rolling in dough! Woo Hoo!

Bill

You do realize that Lake Eerie is probably the biggest settling pond in the world, right?

You could dredge up some lake-bottom soil and apply it to your skin for some DDT-fortified protection from the killer mosquitoes up there though.

[freeztar]

Originally Posted by Michaelangelica

I am told that a few drops of lemon juice to a cup will do the same.
althoug in some places it might be safer to drink the lemon juice

[TheBigDog]

Originally Posted by freeztar

You do realize that Lake Eerie is probably the biggest settling pond in the world, right?

You could dredge up some lake-bottom soil and apply it to your skin for some DDT-fortified protection from the killer mosquitoes up there though.

The biggest worry with Lake Erie is how to put it out if it catches fire again.

The chemicals in the water can be dealt with. Millions of people can live on that water for a long time, with a small percentage suffering side effects of contamination. 100% of those who have no access to water die very shortly, within days or weeks. I think most people prefer the risk and the challenge of thee former over the later.

Bill