摘要：A few years ago I was invited to an international scientific meeting on water and health organized in a developing country with huge problem of water availability and quality: all sessions were opened by an authority. In my session, he complained about the state of the water in his country and felt sad that we ourselves are polluters of the same water we use for drinking, fishing, bathing, irrigating the fields. He was addressing the scientific community to ask the reasons for this paradox and possible solutions. His expression was dismayed, the testimony of a discomfort. What power of purifying polluted water can we have? How did this happen? What mistakes were made? How to fix and find the balance with the environment that surrounds us?
