Orcas are now the most PCB-contaminated mammals on the planet. Many of the distinct populations around the globe - such as the one on the west of Scotland - will likely disappear within the next 50 years. | BBC Science News
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Orcas are now the most PCB-contaminated mammals on the planet. Many of the distinct populations around the globe - such as the one on the west of Scotland - will likely disappear within the next 50 years. | BBC Science News
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