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Why do we need to filter seawater into freshwater?

the question is from my science teacher its: a half page response on why converting salt water to fresh water is so important to humans over the next 100 years.

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Since freshwater supplies will eventually run low we need to be able to change saltwater to freshwater so it is drinkable. There's tons of salt water but not as much fressh

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Salt water can't be drunk as it is. If you could cheaply and efficiently remove the salt to make fresh water you'd be looking at a near inexhaustible source of potable drinking water.

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Scientists give fresh water 20-25 yrs untill theres nomore

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