FORT MCMURRAY, ALBERTA, CANADA - NOVEMBER 2008: Aerial views of the mines of Syncrude Canada Ltd and Suncor Energy Inc, inlcuding one of Suncor's tailing ponds, with oil remains floating on it, as well as mine and refinery. Tar sands, or oil sands, are very dense and contain a form of petroleum The world's largest reserves of tar sands in Canada and Venezuela. Tar sands could equate to approximately two thirds of the total global petroleum resource. Until recently it was financially not viable to extract the oil from the sands, but new technology and rising oil prices have now made it viable. (Photo by Veronqiue de Viguerie/Getty Images)
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