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flag Record heat and drought caused Amazonian lakes in Brazil to exceed 41°C, triggering mass fish and dolphin deaths and threatening ecosystems.

flag In 2023 and 2024, severe droughts and heatwaves caused Amazonian lakes in Brazil to reach record water temperatures above 40°C, with some exceeding 41°C, leading to mass fish and dolphin die-offs, shrinking lake sizes, and isolation of riverine communities. flag A study found that low water levels, murky water, intense sunlight, and calm winds drove extreme warming, with lakes warming 0.3 to 0.8°C per decade—faster than global average—highlighting urgent threats to tropical freshwater ecosystems from climate change.

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