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Climate change, pollution and exploitation by man are putting existential pressure on the world's second-longest river, on which half a billion people depend for survival in Egypt. All along its 6,500-kilometer (4,000-mile) length, alarm bells are ringing. Every year for the past six decades, the Mediterranean has eaten away between 35 and 75 meters (38-82 yards) of the Nile Delta. If the sea level rises even by a meter, a third of this intensely fertile region could disappear, the UN fears, forcing 9 million people from their homes.