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Podcast: PNAS Science Sessions
Episode:

Secrets of Earth's climate in six-million-year-old ice
Category: Science & Medicine
Duration: 00:09:39
Publish Date: 2026-01-12 14:00:00
Description:

Air quality and pet health

Science Sessions are brief conversations with cutting-edge researchers, National Academy members, and policymakers as they discuss topics relevant to today's scientific community. Learn the behind-the-scenes story of work published in the Proceedings of the National Academy of Sciences (PNAS), plus a broad range of scientific news about discoveries that affect the world around us.

In this episode, Sarah Shackleton shares climate lessons learned from 6 million-year-old ice.

In this episode, we cover: •[00:00] Introduction •[01:02] Paleoclimate and ice scientist Sarah Shackleton introduces the information researchers can glean from ice cores. •[02:02] She recounts the age extent of previous ice cores. •[03:03] Shackleton describes the Allan Hills Ice Area. •[04:35] She describes the method for ascertaining the age of air in an ice core. •[05:49] She explains the results of the study and the insights into the climate in Antarctica over the last 6 million years. •[06:32] Shackleton talks about the ice at the base of the core, and the research implications of the study. •[08:13] Caveats and limitations of the study. •[09:11] Conclusion.

About Our Guest:

Sarah Shackleton Assistant scientist Woods Hole Oceanographic Institution

View related content here: https://www.pnas.org/doi/abs/10.1073/pnas.2502681122

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