# Willis Eschenbach 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:** Independent climate writer (self-described amateur); made the chart in Clack's Oct 23 post. - X: [@WEschenbach](https://x.com/WEschenbach), user id 1017165714, ~26.4K followers (Oct 24, 2026). - Describes himself as a "polymath reformed cowboy with no relevant credentials". He has no formal climate-science post and writes as an independent. - Long-time guest author at Watts Up With That (WUWT). Speaker at several Heartland Institute International Conferences on Climate Change (ICCC 4, 7, 9 and 16, per climate-conferences.com). He has also published a *Nature* "Brief Communications Arising" ⚠️ (topic not checked). - **The chart:** "CO2 Levels And Temperatures Since The Cambrian Explosion" pairs GEOCARB III CO₂ (Berner & Kothavala 2001) with PhanDA temperature (Judd et al. 2024), not PhanDA's own CO₂. An earlier version without PhanDA ran in his WUWT post "A Curious Paleo Puzzle" (Feb 23, 2024). Where the PhanDA version first appeared was not found ⚠️. - Appears in: [[Users/@PeterDClack/Post Analyses/Post Analysis - PeterDClack on High-CO2 Epochs and Biodiversity (2026-10-23)|Oct 23 high-CO₂ epochs analysis]].