By now, you’ve probably heard of Detroit’s pet coke piles.
They’re a byproduct of refining Canadian tar sands oil at Detroit’s Marathon refinery, and the ashen piles are definitely an eyesore on the city’s riverfront. But how much of a danger does pet coke really pose?
So far, a definitive answer has proved elusive. But that hasn’t stopped a whole movement from springing up—and gaining some ground in the global fight against tar sands oil.