Arctic ice shrinks to an all-time low in sign of global warming

This image made available by NASA shows the amount of summer sea ice in the Arctic on Sunday at center in white, and the 1979 to 2000 average extent for the day shown, with the yellow line. Scientists say sea ice in the Arctic shrank to an all-time low of 1.32 million square miles on Sunday, smashing old records for the critical climate indicator. That's 18 percent smaller than the previous record set in 2007. Records go back to 1979 based on satellite tracking.