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There are many but the major ones are regarding, Construction, pollution, evaporation and salinization. The links below will give further information. However the threat that is 'invisible' is the evaporation and salinization whereby the Nile water is bringing more salt to the fields of Egypt because of the increased evaporation of water from Lake Nasser. As the evaporation takes place salts are left behind in a more concentrated form and as the water irrigates the land there is an excessive accumulation of salts.

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16y ago

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