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They're obviously not, or we would've seen the effects by now (around a century of plastics in use.)

Remember when RF was the boogeyman? Paranoia about microwave ovens and cellphones causing cancer and other illnesses?

Yes but the amount of plastic in use has increased dramatically. Also there’s evidence that the process of recycling plastic is what creates a lot of the problematic microplastics. We only very recently started recycling plastic.

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