| http://www.w3.org/ns/prov#value | - Canada's oil sands mining operations produce vast and fast-growing quantities of deadly substances, including mercury, heavy metals and arsenic, new data released by Environment Canada show.The information on pollutants sheds new light on the environmental toll exacted by Canada's bid to extract oil from bitumen, showing in stark relief how many nasty substances are being laid on the northern Albe
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