If I remember correctly, it was in 1984 that I was hit by a thunderbolt that still reverberates. I was sitting in a lecture hall listening to my friend, Hans Oeschger, present the results that his group had obtained on the newly completed ice core from the Dye 3 site in southern Greenland. He showed that the oxygen isotope record reproduced all of the abrupt changes found previously in the Camp Century ice core from northern Greenland. These steep sided, repeated ups and downs had half the amplitude of the full glacial/interglacial oxygen isotope change. Spaced at millennium time intervals,...

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