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World Water Forum, a seven-day arena aimed at addressing the planet's deepening crisis of freshwater, was launched in Istanbul yesterday, drawing record-breaking participation by politicians, specialists, corporate executives and activists.

The forum, held only every three years, will address problems of water scarcity, the risk of conflict as countries squabble over rivers, lakes and aquifers, and how to provide clean water and sanitation to billions.

The world's population, currently more than 6.5 billion, is expected to rise to nine billion by mid-century, placing further massive demands on water supplies that are already under strain.