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More than 90% of the key nutrients degrading the Mar Menor, such as ammonium, phosphorus and silica, do not come from streams or continental groundwater, but rather through a mechanism that has so far been overlooked: Water from the lagoon itself infiltrates the sediments and re-

Manganese is an essential trace element. However, in excessive concentrations, the metal can cause health problems. Two Eawag researchers have now produced a global risk map for manganese in groundwater. Half of the world's population uses groundwater as drinking water. According

More frequent weather extremes are leading to water shortages during droughts, and flooding during heavy rain. But groundwater storage can help secure water for dry seasons while mitigating extreme rain.