Goodbye, Frozen North Pole

And just in time for Christmas:

Perhaps the most visible sign of climate change is the Arctic's shrinking sea ice cover. Concerns are growing that we are reaching a point at which the transition to an ice-free Arctic Ocean in summer becomes a rapid one.

...

Even our early climate-change models developed in the late 1970s told us that the Arctic would suffer most from the surface warming that came with adding carbon dioxide to the atmosphere and that this would be intimately tied to the shrinking of its sea ice cover.

This is called Arctic amplification and when we look at our climate records, that is exactly what we see: the climate warming, with the strongest rises in temperature in the Arctic, and those rises linked to the loss of sea ice cover – just as projected 30 years ago.

In other words, even the crudest climate-change models worked quite well here - something that those who cling to the hope that they are "only" models might like to bear in the mind for the future.... (Via DeSmogBlog.)