And why are we now hearing about them?
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There are many forms of them, we have engineered many compounds which are more stable than natural minerals. I don’t know what you’re hearing about now, but one of them are [PFAS](https://www.epa.gov/pfas/pfas-explained ) (polyfluoroalkyl substances). These are very stable compounds for which there is no natural process or microorganism that breaks them down.
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