In the summer of 2014, Markie Miller discovered she'd been drinking toxic coffee. Miller lives in Toledo, Ohio, where fertilizer runoff from farms had caused blooms of toxic cyanobacteria in Lake Erie, her water supply. The city issued an alert at 2 am, but by the time Miller saw it she'd already been sipping her morning java. “I'm like, shit, what did I just expose myself to?” she says.

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