This Feb. 9, 2016, file photo shows ice forming on pipelines built near the Colville-Delta 5 field, or as it's more commonly known, CD5, drilling site on Alaska's North Slope. . (AP Photo/Mark Thiessen,File) **FILE**
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This Feb. 9, 2016, file photo shows ice forming on pipelines built near the Colville-Delta 5 field, or as it's more commonly known, CD5, drilling site on Alaska's North Slope. . (AP Photo/Mark Thiessen,File) **FILE**
