Nature World News: Nearly 66 percent of the world's human population suffers from insufficient access to fresh water for at least one month out of the year. This estimate, which equates to about four billion people, is far greater than scientists thought.
Previously it was believed that that between 1.7 and 3.1 billion people lived with moderate to severe water scarcity for at least one month of year. However, in the latest study, led by Dr. Arjen Hoekstra of the Netherlands' University of Twente, researchers used...