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# How long from now will fresh water on the Earth last?

Question #113185. Asked by SiegeTank55. (Mar 03 10 6:36 PM)

unclerick

The Earth's water moves in a continuous cycle of evaporation, condensation and precipitation. All water used by humans eventually goes back into this cycle.

http://ga.water.usgs.gov/edu/watercyclesummary.html

 Mar 03 10, 7:42 PM
looney_tunes

Water moves through the water cycle, but surface fresh water is a dwindling commodity. Estimates of how long it will be until demand irremediably exceeds supply vary, and are based on models using inbuilt assumptions about continued patterns of use which may well prove to be inaccurate.

http://www.globalchange.umich.edu/globalchange2/current/lectures/freshwater_supply/freshwater.html

 Mar 04 10, 1:43 AM

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