ROBERT SIEGEL, HOST:
From NPR News, this is ALL THINGS CONSIDERED. I'm Robert Siegel.
AUDIE CORNISH, HOST:
And I'm Audie Cornish.
This week, a NASA satellite spotted a new iceberg broken from an ice sheet in Greenland known as the Petermann Glacier. The iceberg is twice the size of Manhattan, 46 square miles, and it's the second time in the last few years that an island sized chunk of ice has calved from the glacier.