FOR a number of years the problems of water have been placed high on the lists of global risks.The basic picture is frighteningly familiar:Today,about two billion people lack access to safe drinking water and most of them live in impoverished,often violent regions of the world.Experts agree that by mid-century,close to four billion people– about 40 percent of the world’s population– will live in water stressed basins.This number is likely to grow when the projected effects of climate change lead to diminished crop yields,while triggering floods and other weather extremes causing further deterioration of water quality.This will surely exacerbate the situation of food security as well as increase displacement of vulnerable groups of people.The ingredients for violent conflict are all there.