[ad_1] Forty years after their ban, the threat of pollutants called PCBs, or polychlorinated biphenyls, still paints a dark picture for the future of the population of orcas. A Danish report in …
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[ad_1] In 1979, more and more scientific evidence led to an indisputable conclusion: polychlorinated biphenyls (PCBs) were toxic. These chemicals have been used for years in a wide variety of industrial applications, …
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[ad_1] Most people thought that the problem of polychlorinated biphenyls – known as PCBs – had been solved. Some countries started to ban toxic chemicals in the 1970s and 1980s, and global …
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