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Farmers’ fields are littered with tiny plastic particles, thanks to cities that turn wastewater into fertilizer. But scientists aren’t sure where those substances go next – or what effect they might have on human health

Lake simcoeUnited statesGreat lakesCanada generalJustin tangMahmoud el saadiJesse vermaireRick smithDavid lapenJill crossmanLara werbowski university of torontoEuropean unionThe globe and mailCarleton universityUniversity of windsorOttawa research development centre