An ice island off the Petermann Glacier in northwestern Greenland, seen here in 2010
An ice island off the Petermann Glacier in northwestern Greenland seen in August 2010 in a NASA Earth Observatory image taken from a satellite. Scottish explorer Cairn Energy on Monday said it had agreed to sell about a third of its interest in the Pitu oil and gas block off Greenland to Norwegian major Statoil for an undisclosed amount.