In this article about sudden, puzzling climate change, why isn't CO2 even mentioned?

Scientists pinpoint final cold snap of the last Ice Age — NZResources.com

The glacier shrank away, exposing these moraines, about 13,000 years ago. In unison with a cold snap across Antarctica, known as the Antarctic Cold Reversal, large glaciers in the Southern Alps grew and pushed down-valley, before suddenly pulling back about 13,000 years ago.

Previous studies of core samples from Arctic and Antarctica ice sheets revealed a climate see-saw at the end of the last ice age, with warming in the north matching cooling in the south, and vice versa.
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This shows that Antarctica and New Zealand began warming up 13,000 years ago at the same time as Europe sank back into a 1,300-year-long ice-age freeze.
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The scientists suggest that variations in the positions of the global wind belts and oceanic water masses provide an explanation for these climate changes.