I have read a statement that the global water supply is sufficient to fulfill the global water demand. But papers I have read did not mention the source(s).
Can someone help me any sources of citation for this statement ?
Water is being consumed at greater rate than ever before and will climate change, we will not have enough using traditional methods. Mankind need to find new ways to increase water supplies. Amir
Dear Dr. Muhamad Khairul Bahri
good greeting
I remember reading such a phrase a few years ago in a book about desalination. This statement is based on the total amount of freshwater available for total consumption requirements, regardless of the irregular distribution of these resources. Where the writer refers to the size of the problem and its reasons elsewhere in the book
The text of this statement and its source are listed below
."The earth contains about 1.4x10^ km^ of water, which covers approximately 70% of the planet surface area; the percentage of salt water in this large amount is 97.5%. The remaining 2.5% is fresh water with 80% of this amount frozen in the icecaps or combined as soil moisture. Both forms are not easily accessible for human use. The remaining quantity, about 0.5%, is believed to be adequate to support all life on Earth. Unfortunately, this water is not distributed evenly throughout the plant and it is not available in sufficient quantities either when or where it is needed. (El-Dessouky, H. T. and Ettouney, H. M., (2002) “Fundamentals of Salt Water Desalination”, Elsevier Science B.V., Amsterdam, Netherlands, PP.670) p. 2
At present, about 40% of the world's population is suffering from serious water shortages. By the year 2025, this percentage is expected to increase to more than 60%. This is because of the rapid increase of population, changes in the life-style, increased economic activities, and pollution that limit the use of fresh water resources.
I hope this contribution is useful to you
please accept my sincere regards
Here, I will start from the term day zero" The City of Cape Town has introduced the idea of Day Zero to focus everyone’s attention on managing water consumption as tightly as possible by cajoling water consumers into reducing usage. Day Zero is when most of the city’s taps will be switched off – literally(http://theconversation.com/day-zero-is-meant-to-cut-cape-towns-water-use-what-is-it-and-is-it-working-92055;p.1).
" Shrinking reservoirs in Morocco, India, Iraq and Spain could spark the next “day zero” water crisis, according to the developers of a satellite early warning system for the world’s 500,000 dams"(https://www.theguardian.com/environment/2018/apr/11/day-zero-water-crises-spain-morocco-india-and-iraq-at-risk-as-dams-shrink,p. 1).
"GLOBAL WATER SCARCITY
Many people are living with less water than they need, whether in the
world's most prosperous cities or in its bountiful agricultural heartland.
"Brazil’s São Paulo, a megacity of 20 million, faced its own Day Zero in 2015. The city turned off its water supply for 12 hours a day, forcing many businesses and industries to shut down. In 2008, Barcelona, Spain, had to import tankers full of freshwater from France. Droughts have also become more frequent, more severe, and affecting more people around the world.
Fourteen of the world’s 20 megacities are now experiencing water scarcity or drought conditions. As many as four billion people already live in regions that experience severe water stress for at least one month of the year, according to a 2016 study in the journal Science Advances. Nearly half of those people live in India and China. With populations rising, these stresses will only mount" (https://news.nationalgeographic.com/2018/03/world-water-day-water-crisis-explained/).
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