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Drought: why rain is not always enoughFrance’s September 2026 assessment shows a marked deficit. But rainfall, soil moisture and groundwater levels do not measure the same thing.
Fresh water: reserves are dwindlingThe WMO’s 2025 global assessment describes river flows that are often below normal and a sustained decline in reserves. Two phenomena that should be distinguished.
On Mars, the rocks of Jezero tell several stories of waterA study based on observations by Perseverance distinguishes at least three episodes of alteration in the Margin Unit. It sheds light on Mars’s ancient environment, without announcing the discovery of life.
Beneath Greenland’s ice, a network of valleys comes into focusA new method infers the buried terrain from subtle deformations in the ice surface. Nearly 2,000 valleys have been mapped, around a third of them newly identified.