Jordi Catalán

A new report from the United Nations University Institute for Water, Environment and Health (UNU-INWEH) toughens the discourse on the current water emergency by referring to an era of "global water bankruptcy". According to the report, the terms "water stress" or "water crisis" are no longer sufficient, as we find ourselves in a situation that goes beyond a temporary crisis, characterised by irreversible losses of natural water resources and the inability to return to historical levels. The report points out that, although not all basins are in water bankruptcy, "enough critical systems around the world have crossed these thresholds" and are interconnected through trade, migration, climate or geopolitics.

Lakes are considered sentinels of climate change, although most research has focused on temperate regions. An international team analysed 10 tropical lakes in the central Amazon during the 2023 drought, which caused high mortality among fish and river dolphins. Using satellite data and hydrodynamic models, the authors show how intense drought and a heatwave combined to raise water temperatures: five of the 10 lakes experienced very high daytime temperatures, exceeding 37°C. Specifically, temperatures in the shallow waters of Lake Tefé soared to 41°C—hotter than a thermal bath. The study is published in Science.