I can't tell you why or how exactly but I personally have been up north above the arctic circle and the permafrost that has been frozen for as long as anyone can tell (1000s of years or longer) is now not frozen. Buildings and bridges have sunk into mud that has not been mud in recoded history. Robins have been seen in the NWT mosquitoes too in regions that have always been too cold for them.
The truly frightening part of the whole thing however is the apex predators, the polar bears are suffering huge problems from pollution they are the keystone species for the world.
I can't say why but I know things have changed in the Arctic but they have. i am certain there will be an impact what that will be I cannot say but something. The past 5 winters are the mildest I have ever seen in my area.
http://www.bbc.co.uk/worldservice/sc...anarctic.shtml
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