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A sign promoting the DC Cannabis Campaign's initiative to legalize marijuana is displayed on a corner in the Adams Morgan neighborhood on November 4, 2014 in NW Washington D.C. (Allison Shelley/Getty Images)

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Russell Girsh, a floor hand for Raven Drilling, helps line up a pipe while drilling for oil in the Bakken shale formation on July 23, 2013 outside Watford City, North Dakota. (Andrew Burton/Getty Images)

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(David B. Gleason/Wikimedia)