Agence France-Presse: The World Water Forum, a seven-day arena aimed at addressing the planet’s deepening crisis of fresh water, was launched here Monday amid a violent protest broken up by riot police using tear gas. The forum, held only every three years, will address growing water scarcity, the risk of conflict as countries squabble over rivers, lakes and aquifers, and how to provide clean water and sanitation to billions. Anti-riot police dispersed some 300 demonstrators against the forum as …