In the late 1970s, the United States banned the production of an assortment of synthetic pesticides, insulators, coolants and flame retardants due to their toxicity and the fact that they stick around for a long time. But according to an article in Chemical & Engineering News (C&EN), the weekly newsmagazine of the American Chemical Society, nature makes compounds similar to these toxic human-made substances - and that could be a concern.
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