There’s now little doubt that the earth climate is changing. What would be the impact on the supply of fresh water? Devastating droughts ravaging huge areas of Asia and Africa and scenes of some of the worst flooding in human memory have been hitting the headlines with alarming regularity. Ever more erratic global weather patterns caused by climate change have added 170 million people to those already experiencing water shortages. The UN's Panel on Climate Change comprising over 1000 of the world''s leading scientists warns that those numbers will rise.

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