Hide the decline - Estimating Arctic sea ice area 1920-1978 using temperature stations

Arctic sea ice area in september (minimum) has a lot of attention in the climate debate. However, we cannot know ice areas in the MWP or even in the last warm period, 1920-78. Due to evidence from wood remnants etc, we know, that it has much warmer in Greenland in the MWP than it is today, and thus we have to take for granted, that Arctic ice areas in the MWP was smaller than today.