Mangok Bol has returned to South Sudan to search for his nieces and nephew who were abducted by militants.
A sheet of ice, twice the size of Manhattan, broke of from a glacier in Greenland this week.
The new iceberg measures 46 square miles. In 2010, the Petermann Glacier lost chunk of ice measuring 96 square miles. The loss of glacier mass in Greenland, which has seen warming temperatures, has scientists concerned.