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Mar 12, 2015, 1:05 pm20 ptsGrist
Though all oils are dirty, some are dirtier than others. High-profile case in point: the Canadian tar sands. The fact that tar-sands oil is one of the filthiest oils in the world has helped fuel the debate around the Keystone XL pipeline. The good folks at the Carnegie Endowment for International Peace thought…
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