Lonnie Thompson and Ellen Mosley-Thompson at The Ohio State University have been studying ice cores from around the world for over 30 years. They collect, store and study ice cores to understand the history of the Earth's climate and preserve them for future scientists. In this interview, they explain how ice cores preserve evidence of rare but impactful changes in Earth's history often called "black swan" events, as well as smaller environmental changes and why it is necessary to preserve the ice cores and the glaciers they come from.