Scientists Map Earth's Groundwater

According to a new study that estimates the amount of existing groundwater around the planet for the first time, we may be using up the earth's water supply more quickly that it is being replaced. Researchers, including a team at the University of Texas, who published their results in the journal Nature Geoscience, calculated that the earth contains a total volume of around 5.5 million cubic miles of groundwater, but that it will take future research to determine how quickly that volume will run out. (Gizmag)