^^^ um, first of all, Greenland was called given its mixed up moniker to keep people from all moving to iceland, which was discovered shortly after Greenland, and was much tighter, and the vikings wanted to keep it to them selves.  i read it in a book called the Discoverers, by Daniel J. Boorstein.
and if you look at any paleoecological proxy data, such as glacial core sampling or dendrochronology studies, you will find that global warming is not a sham, and that a warming trend such as the one we are seeing right now is completely unprecedented in all history.  the rate at which temperatures are now rising are something like 10 times that of the medieval warming spell( about 700-900 years ago, not 2,000) which allowed the vikings to do their crazy voyages up north.  scientists call it the hockey stick effect, because of the way the indisputable graphical data looks like a hockey stick.
bad news for skiing, indeed