Droughts and heatwaves causing water in some areas to reach 41C, killing fish and endangered dolphins, say researchers

Amazonian lakes are being transformed into simmering basins hotter than spa baths as severe heatwaves and drought grip the region, research shows.

The temperature of one lake exceeded 40C (104F) as water levels plummeted under intense sunlight and cloudless skies. The extreme heat triggered mass die-offs among endangered Amazon river dolphins and fish, which cannot survive in such high temperatures.