Researchers have determined that summers on the Norwegian archipelago of Svalbard are now warmer than at any other time in the last 1,800 years, including during medieval times when parts of the northern hemisphere were as hot as, or hotter, than today.  

They also discovered that Svalbard was not particularly cold during the recent “Little Ice Age” of the 18th and 19th centuries, when glaciers on Svalbard surged to their greatest extent in the last 10,000 years and glaciers in many parts of Western Europe also grew. They suggest that snow, rather than colder temperatures, may have fed the growth of Svalbard glaciers.
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