Iceberg the size of Delaware breaks off Antarctic ice shelf

For several years, scientists have been watching a crack 120 miles long on the Antarctic Peninsula. Now it's produced one of the largest icebergs ever recorded. Eric Rignot is a professor of Earth System Science at the University of California at Irvine, and a principal scientist for the Radar Science and Engineering Section at NASA's Jet Propulsion Laboratory. Rignot says the calving provides a glimpse of Planet Earth's future.