# Jessica Tierney Back to [[Topics/Climate Change Science and Policy Debate/Climate Change Science and Policy Debate|Climate Change Science and Policy Debate]] · [[Topics/Climate Change Science and Policy Debate/Research and Evidence|Research and Evidence]] **Role:** Paleoclimatologist, University of Arizona; senior co-author of Judd et al. 2024. - Professor of Geosciences at the University of Arizona ⚠️ (title from memory). - Senior co-author of Judd et al. 2024 (485-Myr temperature record). - Led Tierney et al. 2020, *Nature*, "Glacial cooling and climate sensitivity revisited" ([doi](https://doi.org/10.1038/s41586-020-2617-x)). It estimated Last Glacial Maximum cooling of about 6°C and was used to constrain climate sensitivity ⚠️ (value from memory). - Relevance: the deep-time data Clack relies on comes from her group, and their work treats CO₂ as the main lever. - PhanDA output (the GitHub repository is `EJJudd/PhanDA`) is the temperature source cited in the Eschenbach chart in Clack's Oct 23 post. See the [[Users/@PeterDClack/Post Analyses/Post Analysis - PeterDClack on High-CO2 Epochs and Biodiversity (2026-10-23)|Oct 23 high-CO₂ epochs analysis]].