Once dead, London’s Thames river is now teeming with seals, porpoises, and even a whale or two

In 1957, the Thames—the huge river that flows though the city of London—was declared biologically dead. And for most of London’s history, its river has been more of a hazard than a habitat. Effluent from Victorian sewers flowed into it. Chemicals from the prolific 19th-century laundries that lined the banks killed off most of the fish, and pretty much anything else that formerly lived in what came to be called the Great Stink. Yet now it’s teaming not just with fish but with marine mammals.
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