Although polychlorinated biphenyls are now banned, they continue to harm animals' health.
Polychlorinated biphenyls are a group of 209 artificial chemicals that were once widely used in the production of electrical equipment, paints and surface coatings., 1.5 billion pounds of PCBs were produced between the 1920s and their ban in 1979 and the 1980s . While they are now illegal, the toxins persist in the environment, where they continue to harm animals' health.
This is because mothers unwittingly detox themselves of the PCBs during feeding, say researchers writing in the journal"PCBs appear to be particularly persistent in relation to other legacy toxins," Rosie Williams, Lead Author and PhD Researcher at ZSL and Brunel University in London, told"The latest U.N. Environmental Program assessment estimated that 14 million tonnes of PCB contaminated equipment and material still needs to be destroyed.
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