The boreal forests of Alberta, Canada are home to vast deposits of oil sands, also called tar sands. The oil extracted is a thick, sticky form of crude known as bitumen, which emits more carbon than conventional oil when burned and the mining itself has a heavy environmental footprint, heavily opposed by climate and environmental activists.

The Dilbit Disaster: Inside The Biggest Oil Spill You've Never Heard Of

InsideClimate News won the 2013 Pulitzer Prize in national reporting for this four-part narrative and six follow-up reports into an oil spill most Americans have never heard of. More than 1 million gallons of oil spilled into the Kalamazoo River in July 2010, triggering the most expensive cleanup in U.S. history—more than 3/4 of a billion dollars—and after almost two years the cleanup still isn't finished.

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