Are there any facts, data on this?
That is my question.
Mainly around the North Atlantic, although not as hot as now
Yes, plenty
For the 2,000-year record, see
http://en.wikipedia.org/wiki/File:2000_Y
Thats
/wiki/File:2000_Year_Temperature_Comp
The National Academies Press has released a book (free online) discussing the climate for the past 2000 years, and how well we know it: Tree rings, ice cores, error bars, the lot:
http://www.nap.edu/catalog.php?record_id
Thats
...edu/catalog
php?record_id=11676
Sunspot cycles. That is the answer.
Paul B is right it wasn
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