Great white sharks, along with other mesothermic species, are facing a significant threat as ocean temperatures rise due to climate change. These sharks maintain body temperatures warmer than surrounding waters, which has historically given them a predatory advantage. However, as the oceans warm, they risk overheating, which could be fatal. According to a report published in the journal *Science*, these sharks, including species like thresher and porbeagle sharks, require more energy to sustain their elevated body temperatures. This situation is worsened by overfishing, which reduces their available food supply, creating a 'double jeopardy' scenario. As water temperatures rise, sharks are forced to migrate to cooler areas, but suitable habitats are diminishing. Lead author Nick Payne from Trinity College Dublin emphasizes that these changes reflect a broader trend of animal movement in response to climate change. The sharks' ability to swim fast and migrate long distances is compromised as they struggle to manage their body heat, especially during summer months when competition for prey intensifies.