verage in the 1950s, 
1960s, and 1970s. The brown bars show the thickness in the last 15 
years. You see it has gone down to under 2\1/2\ meters of thickness, 
probably a 40 percent reduction in thickness at the North Pole.
  It is not isolated. In the Nansin Basin there was about 4 meters of 
thickness. It has gone down to about 2.25 meters. In the Eastern 
Arctic, it is even more pronounced, from about 3.4 meters down to about 
1\1/2\ meters. It is the same story all across the Arctic. The Arctic 
is melt