At this time the tundra permafrost in Alaska and Russia is softening to liquid at depths that have been frozen for thousands of years; ice shelves are breaking away into the sea in unprecedented chunks as large as small states.

These are empirical data, from what I have read; they werte reported in a series in The NEw Yorker earlier this year; wish I had links to them.

But there is little question, if the author's facts are correct, that the warming phenomenon is outside the range of "normal" rise and fall curves from the last couple of centuries of recorded data.

I'll see if I can come up with a link to substantiate these recollections.


A