Miles O’Brien:

And so does the asbestos. The United States has imported more than 6,000 tons of asbestos since 2011, almost all of it used by the chlor-alkali industry to make chlorine. It mostly comes from Brazil, but, in 2017, that country banned the mineral, as have more than 60 other nations.

As Brazil winds down production, asbestos imports will increasingly come from Russia, where some shipments are stamped with a seal of the president's face, along with the words "Approved by Donald Trump, 45th President of the United States."

Meanwhile, in Southern Nevada, Brenda Buck and her colleague medical geologist Rodney Metcalf have found even more troubling cause for concern about asbestos.

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