PCB pollution threatens to wipe out killer whales

PCB pollution threatens to wipe out killer whales  Phys.Org PCBs Are Killing Killer Whales  HowStuffWorks Chemical pollution could wipe out half of all killer whale populations  CNN Learn about Polychlorinated Biphenyls (PCBs) | Polychlorinated Biphenyls (PCBs) | US EPA  EPA Predicting global killer whale population collapse from PCB pollution  Science MagazineFull coverage

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