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— Kate Orff"[The oyster] accepts algae and detritus in one end - and through this beautiful, glamorous set of stomach organs, out the other end comes cleaner water."
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But we have not used our waters well. Our major rivers are defiled by noxious debris. Pollutants from cities and industries kill the fish in our streams. Many waterways are covered with oil slicks and contain growths of algae that destroy productive life and make the water unfit for recreation. "Polluted Water-No Swimming" has become a familiar sign on too many beaches and rivers. A lake that has served many generations of men now can be destroyed by man in less than one generation.
— Lyndon B. Johnson
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Coral reefs are under assault. They are rapidly being degraded by human activities. They are over-fished, bombed and poisoned. They are smothered by sediment, and choked by algae growing on nutrient-rich sewage and fertilizer run-off. They are damaged by irresponsible tourism and are being severely stressed by the warming of the world's oceans. Each of these pressures is bad enough in itself, but together, the cocktail is proving lethal.
— Klaus Topfer
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