Half the World’s Killer Whale Populations at Risk From Toxic Chemicals

EcoWatch
By Olivia RosaneSep 28, 2018, 7:49 am54 pts
Polychlorinated biphenyls (PCBs) were banned in the U.S. in 1978, but their persistence in the world's oceans is still posing a major threat to killer whales. A study published in Science Friday found that current concentrations of PCBs could lead to the disappearance of half of the world's killer whale, or…

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