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P. Solar says:
Very interesting article. Some solid research. I’ll look deeper into what you found in Briffa’s data.
One thing I note in the “Terrum” map is the apparently huge extent of Antarctica. Allowing for inaccuracies of these times etc it does still seem to have an extent almost twice of what it is currently.
The fact that the two polar regions tend to behave in opposing trends may support the idea of a much larger ice coverage in Antarctica and less in the North as is suggest by this article.
Sounds reasonable.