After a boat captain notices strange black goo on his ship’s rudder, he scoops some of it into a cup. A few months later, that cup ends up in a lab, where scientists make a surprising discovery.

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In northwest Indiana, there’s a 20-mile stretch of Lake Michigan that’s dominated by industry. It’s some of the dirtiest water in the lake, but it's also home to some of the biggest waves anywhere on the Great Lakes. Despite the pollution, there’s a dedicated group of surfers who keep flocking to this area. And one day, after a really big chemical spill from one of the factories, the surfers decide to do something about it.

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Kevin Shafer is obsessed with rain. As the head of the Milwaukee Metropolitan Sewerage District, it’s his job to be. But when a thousand-year storm comes out of nowhere and dumps over a foot of rain, Kevin is faced with a decision: send sewage into people’s basements or into Lake Michigan.

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