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Why does water need conservation even though large oceans surround the land masses?

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Water covers about 71\% of the earth's surface but only 3\% of the earth's water is fresh and more over 0.5\% of the earth's water is available fresh water. 2.5\% of the earth's fresh water is unavailable: locked up in glaciers, polar ice caps, atmosphere, and soil; highly polluted; or lies too far under the earth's surface to be extracted at an affordable cost. Marine water is not useful for human and plant life directly due to high salt content. Water conservation is important because fresh clean water is a limited resource, as well as a costly one.

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