Antarctic sea ice levels reached record-breaking lows last week — and this "extraordinary behavior" could mark the start of its long-term decline, scientists warn.
As of June 27, the extent of sea ice in Antarctica was nearly 1 million square miles (2.6 million square kilometers) below average for this time of year, compared with the period between 1981 to 2010, according to the National Oceanic and Atmospheric Administration (NOAA). That's equivalent to losing an area of ice nearly four times the size of Texas.
