Sharks and tuna are overheating and running out of options

Some of the oceans fastest and most fearsome predators-like great white sharks and tuna-are running hotter than expected, and its costing them dearly. New research shows these warm-bodied fish burn nearly four times more energy than cold-blooded species, forcing them to eat more while also struggling to shed excess heat. As oceans warm, this creates a dangerous double jeopardy: rising temperatures push them closer to overheating, while shrinking food supplies make survival even harder.