Water use in the USA is will rise to become a national issue in the next few years. Article: http://agtoday.us/1hGoLdt This GRACE-based map shows the rate that groundwater supplies – which worldwide are estimated to compose half of our drinking water – have changed from 2003 to 2012. The way the satellites snag this data is rather neat; they sample tiny shifts in the earth's gravity, and from those changes deduce how much H2O is hiding beneath the soil. There's nothing neat about how vast portions of the country are drying out, though, which are shown on this map in angry red that indicates the historical "freshwater storage rate of change"
Via John Blue