Fresh Water Crisis: Four Billion People Face Water Scarcity, Says Study

Fresh water on Earth is scarce and getting scarcer – we know that. In 2015 the World Economic Forum ranked "water crises" as the top riskfacing the planet. 

But authors of a recent report published Friday in the journal Science Advances say previous studies have underestimated the severity of water scarcity around the world. Instead of impacting around two billion people as researchers previously suggested, it’s more along the lines of four billion, say Dr. Mesfin Mekonnen and Dr. Arjen Hoekstra at the University of Twente in Enschede, Netherlands.