Snowball Earth
For a different kind of hockey stick check out this article:-
http://www.foresight.org/nanodot/?p=3553
An extract:-
I’m looking at the temperature record as read from this central Greenland ice core. It gives us about as close as we can come to a direct, experimental measurement of temperature at that one spot for the past 50,000 years. As far as I know, the data are not adjusted according to any fancy computer climate model or anything else like that.
So what does it tell us about, say, the past 500 years? (the youngest datum is age=0.0951409 (thousand years before present) — perhaps younger snow doesn’t work so well?)
The charts in this article make for an interesting narrative.
p.s. the title of my post is dedicated to Graeme Bird. 
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