if the total amount of water on earth does not change, why are there concerns about global shortages of fresh water?

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Answer:Because the total amout of water changes, the type of water changes. This is a masimve amout of undrinkable water compared to the amout that is drinkable. It is hard to find sorces of fresh water, and when they are found, they are exploted to the point where their is no more in that source.Explanation:Pls mark Brainliest with the crown