GENEVA Climate change is spurring increasingly erratic and extreme swings between deluge and drought across the world, the United Nations warned Thursday. The U.N.'s World Meteorological Organization (WMO) said in a report that the world's water cycle was becoming ever more unpredictable, with shrinking glaciers, droughts, unbalanced river basins and severe floods wreaking havoc. "The world's water resources are under growing pressure and, at the same time, more extreme water-related hazards