Because the water available on earth is is 70% but only 2.5 % of fresh water is available for human. use that's why the water is still a scare for us.
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Yes it rgt that only for lack of fresh water on earth, water is scacre in some areas... It is because most the rain water is used for industrial purpose, agriculture purpose etc... so that's why only 2.5% water is now fresh only on earth
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