Ocean temperatures along the California coast have climbed up to 4°C above average, driving whales away from usual feeding spots, starving seabirds, and pushing great white sharks uncomfortably close to public beaches.

On a boat off the coast of California, Sara Lesser gazes wistfully at dozens of dolphins playing in the vessel's wake. This summer, extreme heat is making such a scene…

Ocean temperatures along the California coast have climbed up to 4°C above average, driving whales away from usual feeding spots, starving seabirds, and pushing great white sharks…