New Scientist: Earth holds enough water underground to flood the surface of the continents to a depth of 180 metres - or raise sea levels by 52 metres if it were spread over the entire globe. But only a small percentage of this is renewable on a human timescale.
The size of this smaller renewable reservoir - never known until now - may help governments manage water resources in the face of growing demand.
Society is increasingly relying on groundwater from wells and springs for drinking and, especially, for...