I would be curious what the exact ice cover was during summers in the years 900AD- 1250AD.
Has this thinning ice cover happened before. I’m sure it has.
“Records dating back to 1958 have shown a gradual warming of Arctic temperatures which speeded up in the 1980s. “
How believable is this stuff? The 1980’s were the great global cooling era. They seem to skew the numbers to fit there agenda. Figures lie, liars figure.
The Northwest Passage was open then. although there were complaints that it was icing over by 1400.