HI, I am doing an OU degree for fun. The present Module I am doing is about Environmental politics. You are right as 73% of the Earth's surface is Sea Water, and fresh water is in short supply, or rather unequally allocated. Don't believe the Water Aid begging adverts, as in Africa, the Chinese have built huge dams on major rivers that have denuded rivers into adjoining countries. See the Grand Tour film on the Mekong River in Vietnam. The last ice age was supposed to have an Ice Sheet a mile thick over the whole of the northern hemisphere as far south as Spain. Where is that water now? Sealevels were supposed to have risen by 60 metres almost overnight in Geological time. No humans then to light a fire and melt the ice. Its all a scam to make more money for the rich, and stop you driving your Landy. The world is awash with oil, and petrol and diesel should be free! Have a good day, and kill the Planet before it kills you.