This Aug. 5, 2010 satellite image provided by NASA shows an ice island that has broken off the Petermann Glacier in northern Greenland. A University of Delaware researcher says the floating ice sheet covers 100 square miles (260 sq. kilometers) _ more than four times the size of New York's Manhattan Island. (AP Photo/NASA)

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This Aug. 5, 2010 satellite image provided by NASA shows an ice island that has broken off the Petermann Glacier in northern Greenland. A University of Delaware researcher says the floating ice sheet covers 100 square miles (260 sq. kilometers) _ more than four times the size of New York's Manhattan Island. (AP Photo/NASA)