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The Conversation
The Conversation
Science
Leslie Petrik, Professor / Leader of the Environmental and Nanoscience Research Group, University of the Western Cape

Marine life in a South African bay is full of chemical pollutants

Limpets had the highest concentrations of chemical compounds compared to other marine organisms studied. A. Mertens/Shutterstock

The adage “out of sight, out of mind” has long summed up humans’ attitude to dumping personal and industrial waste. In a 1974 Scientific American article, the oceanographer Willard Bascom wrote that “the ocean is the plausible place for man to dispose of some of his wastes”. If done “thoughtfully”, he continued, “it will do no damage to marine life.”

But it hasn’t been done thoughtfully. Earth’s oceans are not only full of plastics: they’re also clogged with dumped medications, antibiotics, disinfection products, household chemicals and pesticides, among other products. This isn’t just bad news for the environment and marine life. It harms humans, too. The compounds contained in some of these dumped products cause feminisation and lower the quality of sperm. They can also lead to sexual abnormalities and reproductive impairments in both sea life and humans, as well as causing persistent antibiotic resistance and endocrine disruption.

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