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en.wikipedia.org/wiki/Fresh_water

Fresh water is naturally occurring water on Earth's surface in ice sheets, ice caps, glaciers, .... Fresh water is an important natural resource necessary for the survival of all ecosystems. ... the finite resources avialability of clean fresh water The World Bank adds that the response by freshwater ecosystems to a changing climate ...

www.answers.com/Q/How_is_fresh_clean_water_produced_in_nature

if the water flows through a material such as sand, the impurities get trapped and the water passes through.

www.nature.org/ourinitiatives/habitats/riverslakes/protecting-clean-water-for-people-and-nature.xml

We work with people all over the world to make our rivers and lakes clean, ... and practices that use less water while continuing to produce the food we need. ... Did you know that forests play a critical role in keeping our freshwater clean?

water.usgs.gov/edu/watercyclefreshstorage.html

Dec 2, 2016 ... Interlaken, Switzerland is situated between two lakes; these freshwater bodies serve many purposes, both for nature and for people.

www.nature.com/news/2008/080319/full/452260a.html

Mar 19, 2008 ... The US$3-billion government-owned plant will produce more than ... condensing — can produce fresh water at less than US$1 per cubic metre.

www.conservation.org/what/Pages/fresh-water.aspx

Less than 1% of the fresh water on Earth is readily accessible for human use. We have to use ... responsibly. And we must protect the natural places, like forests and wetlands, that store, filter and supply clean water for everyone on the planet.

www.fao.org/english/newsroom/focus/2003/dec_idm_3.htm

Mountains and freshwater. Mountains are often called nature's water towers. They intercept air circulating around the globe and force it upwards where it ...

www.cbsnews.com/news/getting-clean-water-from-the-sea-at-a-high-price

Feb 18, 2014 ... "We'll produce enough water to meet the daily needs of 300,000 San Diego ... could help reduce the cost of turning salt water into fresh water.

academic.evergreen.edu/g/grossmaz/murphymw

By understanding the nature of the global water cycle, and its importance to all peoples, ... The water cycle is the process by which our freshwater is produced.

www.acs.org/content/acs/en/pressroom/podcasts/globalchallenges/freshwater.html

Water Desalination: Freshwater from the Sea ... arid regions of the world, and to treat water in other areas that is fouled by natural and ... The average cost to produce 1 acre-foot of desalinated water from seawater ... 10, 2007; Keeping It Clean