Global Study Finds Rivers Worldwide Losing Dissolved Oxygen, Tropical Waterways Most Affected
A study published May 15 in Science Advances reports that dissolved oxygen levels in rivers worldwide have declined over the past four decades. The research, led by Prof. Kun Shi of the Nanjing Institute of Geography and Limnology (NIGLAS) at the Chinese Academy of Sciences, analyzed data from 21,439 river reaches collected between 1985 and 2023. According to the study, nearly 80% of the rivers studied showed deoxygenation, with tropical rivers experiencing the strongest losses. Climate warming was identified as the primary driver, accounting for 62.7% of the observed decline.
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