A new study based on modeling shows that though banned in 1979, PCB industrial chemicals (polychlorinated biphenyls) are lingering in the blubber of killer whales — and they may end up wiping out half the world’s population of killer whales in coming decades.

Killer Whales Face Dire PCBs Threat

Concentrations of the toxins are very high, lingering in the orcas’ blubber, and are passed from mother to calf.

New York Times

Also known as orcas, killer whales are intelligent, social animals that pass survival information from grandmother to mother to daughter. Unfortunately, these magnificent creatures are in danger of a persistent man-made threat…A new study shows that PCB chemicals are lingering in the blubber of killer whales — and they may end up wiping out half the world’s population of killer whales in coming decades…

The most at-risk killer whales are those that eat seals and other animals that are…