Burn pits: Behind the 'silent killer' ignored by the U.S. government for years - a podcast by WBUR & NPR

Burn pits in Afghanistan and Iraq. Vast piles of U.S. military waste set alight, pouring smoke into the air that U.S. soldiers would breathe. Why were they ignored for so long? Megan Stack, Le Roy Torres and Dan Brewer join Meghna Chakrabarti.

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