29 September 2010 Updated at 13:01 ET
Water map shows billions at risk of 'water insecurity'
Richard Black
Environment correspondent, BBC News
The study maps water availability and quality down to the regional level
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About 80% of the world's population lives in areas where the fresh water supply is not secure, according to a new global analysis
link-
http://www.bbc.co.uk/news/science-environment-11435522