# Haijun Song 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:** Paleontologist, China University of Geosciences (Wuhan); temperature thresholds for mass extinction. - Paleontologist at the China University of Geosciences, Wuhan. - **Song et al. 2021, "Thresholds of temperature change for mass extinctions"**, *Nature Communications* 12:4694 ([doi](https://doi.org/10.1038/s41467-021-25019-2)). Over 450 Myr, the size of temperature change correlates with extinction magnitude (ρ ≈ 0.76). Mass extinctions line up with changes of more than ~5.2°C and rates faster than ~10°C per Myr. - Relevance: deep-time records link fast warming to extinction, the opposite of Clack's reading. - Appears in: [[Users/@PeterDClack/Post Analyses/Post Analysis - PeterDClack on High-CO2 Epochs and Biodiversity (2026-10-23)|Oct 23 high-CO₂ epochs analysis]].