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    Canada oil coke stirs trouble in US

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    Al Jazeera English

    by Al Jazeera English

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    Canada's oil sands boom is producing an unwanted by-product - huge piles of petroleum coke. Tens of millions of tonnes of the black powdery substance are accumulating in both Canada and the US. Daniel Lak reports from Detroit - where big clouds of coke blew into homes last month.