IIRC, Greenland and Iceland were both known to Vikings, and Greenland had Viking colonies. Now it’s covered in ice.
So, it was WARMER in the past. Right? And if Greenland melts a little, isn’t that returning to what it was?
Actually, lack of sunspot activity says Greenland will get even more frozen.
Instead, the new research suggests that the dominant cause of the Greenland glaciation was the fall from high atmospheric carbon dioxide levels to levels closer to that of pre-industrial times. Today concentrations are approaching the levels that existed while Greenland was mostly ice-free.
Dr Alan Haywood from the University of Leeds added: “So why did elevated atmospheric carbon dioxide concentrations fall to levels similar to the pre-industrial era? That is the million dollar question which researchers will no doubt be trying to answer during the next few years.”
http://www.sciencedaily.com/releases/2008/08/080827163818.htm