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Toxic chemicals banned 40 YEARS ago could cause a 'killer whale apocalypse' In 1978, chemicals called 'polychlorinated biphenyl' (PCBs) were banned, after it was discovered that they were toxic. But despite this ban, PCB are still abundant in nature today - and they're wreaking havoc on several animals.
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Chemical pollution could wipe out half of all killer whales (CNN) - Chemical pollutants banned more than 40 years ago are still having a devastating effect on marine life and could lead to the disappearance of half the world's population of killer whales before the end of the century.
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