China Daily: It is the 16th World Water Day since it was initiated by the United Nations in 1992 to promote awareness of increasingly serious water problems and press for action by governments worldwide to save and protect water resources. Benjamin Franklin once said: "When the well is dry, (then) we know the worth of water." However, we must know its worth before it is too late and the lack of water, or the want of drinkable water, threatens the existence of human life. …