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Where do the pollutants come from?There are two main sources,ー sewage and industrial waste.As more detergent is used in the home,so more of it is finally discharged with the sewage into our rivers,lakes and seas.Detergent harms water birds,by dissolving the natural fatty substances,which keep their feathers waterproof.Sewage itself,if it is not properly treated,pollutes the water and prevents all forms of life in rivers and thb sea from receiving the oxygen they need.
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