This Nov. 6, 2015, file photo shows a sign for TransCanada's Keystone pipeline facilities in Hardisty, Alberta, Canada. TransCanada Corp.’s Keystone pipeline leaked oil onto agricultural land in northeastern South Dakota, the company and state regulators said Thursday, Nov. 16, 2017, but state officials don’t believe the leak polluted any surface water bodies or drinking water systems. (Jeff McIntosh/The Canadian Press via AP, File)
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