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 increasingly rare.

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…

Una ola de calor marina frente a California reduce el avistamiento de ballenas y delfines, acerca tiburones a la costa y amenaza el equilibrio del ecosistema.