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FILE - In this Feb. 9, 2016, file photo, ice forms on pipelines built near the Colville-Delta 5 field, or as it is more commonly known, CD5, drilling site on Alaska's North Slope. Five environmental groups sued the federal government Friday, claiming the Interior Department conducted a petroleum lease sale in northern Alaska without proper environmental review. (AP Photo/Mark Thiessen, File)

FILE - In this Feb. 9, 2016, file photo, ice forms on pipelines built near the Colville-Delta 5 field, or as it is more commonly known, CD5, drilling site on Alaska's North Slope. Five environmental groups sued the federal government Friday, claiming the Interior Department conducted a petroleum lease sale in northern Alaska without proper environmental review. (AP Photo/Mark Thiessen, File)

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