The atmospheric CO2 content record for the Holocene, as preserved in Antarctic ice, has a puzzling feature. The steep rise during the Younger Dryas time is followed by a small drop during the early Holocene. Then, about 8,000 years ago, this decline bottomed out and the CO2 rise resumed and continues to the present. An earlier and less precise version of this record, which had an even more pronounced CO2 oscillation, caught my eye. In 1993, I published a paper attempting to explain it. I proposed that the dip was the result of regrowth, during the early...

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