Provenance
Slides by Cynthia Fadem, using images from Jean-Pierre Normand, British Antarctic Survey, Kendrick Taylor, University of Nevada-Reno/National Oceanic and Atmospheric Administration Paleoclimatology Program/Department of Commerce, Mark Twickler, University of New Hampshire/National Oceanic and Atmospheric Administration Paleoclimatology Program/Department of Commerce, NOAA.

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