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FILE--In this undated file photo, drilling operations at the Doyon Rig 19 at the Conoco-Phillips Carbon location in the National Petroleum Reserve, Alaska, are shown. 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/Judy Patrick, File)

FILE--In this undated file photo, drilling operations at the Doyon Rig 19 at the Conoco-Phillips Carbon location in the National Petroleum Reserve, Alaska, are shown. 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/Judy Patrick, File)

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