Great White Sharks Are Struggling in Warming Seas

Great white sharks have survived for millions of years by being extraordinary.

They are not the mindless villains humans turned them into. They are warm-bodied ocean predators. They hold heat inside their bodies, swim with power, travel enormous distances and sit near the top of marine ecosystems. That biological edge helped make them who they are.

Now it may help kill them.

Great white sharks and other warm-bodied marine animals, including basking sharks, porbeagles, threshers and large tuna, are being pushed towards overheating as the oceans warm. These animals already burn far more energy than cold-blooded fishes. In warming seas, they must work harder, move differently, dive deeper or leave. A one-ton warm-bodied shark may struggle to remain in water above 17°C. Imagine being so perfectly adapted to the ocean that your own body becomes a trap. That is what human industry has done.

According to Gerard Wedderburn-Bisshop’s climate accounting, animal agriculture is the primary driver of climate change, responsible for 53% of global average temperature rise between 1750 and 2020. Fossil fuels? Just 19%.

Sharks are facing a double attack. Their bodies are being pushed beyond their limits by warming waters, while their food supply is being stripped away by fishing. Fishing and bycatch remain the most urgent immediate threat. Huge nets and long lines do not care who they catch. Sharks, rays, turtles, seabirds, fishes, dolphins. Individuals reduced to collateral damage in the business of dragging life from the sea.

Then humans act surprised when ecosystems start to collapse.

Great whites are sentinel species. When they disappear, move or change behaviour, they are not “abandoning” an area. They are telling us something is wrong. Their absence is a warning sign from an ocean being heated, emptied and reorganised by human appetite.

For years, sharks were sold to the public as monsters.

The real monsters built fishing fleets, destroyed habitats, filled the atmosphere, cleared forests, bred billions of land animals into existence and called the whole thing food.

Sharks are overheating because humans turned animals into products, oceans into extraction zones, and the climate into an invoice nobody in power wants to pay.