Green shows current ice. Red shows 1971 ice.
The IPCC report from 1990 showed that ice extent was low in the early 1970s.
NCAR also noted that prior to 1972, ice extent was low.
by Walter Orr Roberts Aspen Institute for Humanistic Studies, and National Center for Atmospheric Research, Boulder, Colorado
In February of 1972 earth-orbiting artificial satellites revealed the existence of a greatly increased area of the snow and ice cover of the north polar cap as compared to all previous years of space age observations.
Alarmists want you to believe that there used to be a lot more ice, but they are lying.