for scene 46 of the video " Ice Age 2050s: Certainty 1" by Rolf Witzsche
here for a larger image
The NGRIP project
That these immense temperature swings during the last Ice Age are not anomalies of a specific drilling site on Greenland, became apparent when the deep drilling was repeated a decade later at another location on the Greenland Ice Sheet, further north, called the NGRIP project.
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Published by Cygni Communications Ltd.
North Vancouver, BC, Canada - (C) in public domain - producer Rolf A. F.