Finding more fresh water is one of the paramount challenges of the 21st century. Nearly one-third of the human race lacks reliable access to clean water, according to the International Water Management Institute. Some 3 million people – most of them children – die every year from diseases spread by contaminated water. A 2007 report by the U.N. Environment Program predicts that by 2025, if population growth and environmental degradation continue apace, 1.8 billion people will live in countries with “absolute water scarcity.”
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Source: http://miller-mccune.com/science_environment/findi