Refining Canada’s oil sands produces petroleum coke, called "the dirtiest residue from the dirtiest oil on earth." It's piling up along the Detroit River, NYT reports, thanks to a Marathon Petroleum refinery that began refining Canadian oil sands in November. Detroit’s pile will not be the only one. Canada’s efforts to sell more products from oil sands to the U.S., which include transporting it through the proposed Keystone pipeline, are pulling more coking south to U.S. refineries, creating more waste product.
Refining Canada’s oil sands produces petroleum coke, called "the dirtiest residue from the...
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