Question

Why are drinking water supplies still a major concern for many countries?

Solution

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Most of the water on Earth is salt water, which humans cannot drink unless the salt is removed. Some fresh water is locked in glaciers and polar ice caps, or is present in the atmosphere.

The Earth’s water supplies are threatened by pollution. So, the effort to supply fresh drinking water in relation to the great expansion of the human population is considered as a major challenge in this century.

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