# Simon Dietz Back to [[Authors/@BjornLomborg/People/People|Lomborg People]] · [[Authors/@BjornLomborg/BjornLomborg-x-profile|@BjornLomborg]] · Topic: [[Topics/Climate Change Science and Policy Debate/Climate Change Science and Policy Debate|Climate Change Science and Policy Debate]] **Role:** Professor of Environmental Policy at the London School of Economics (Grantham Research Institute); lead author of the 2021 PNAS study of the economic impacts of climate tipping points - Lead and corresponding author of Dietz, Rising, Stoerk and Wagner (2021), [Economic impacts of tipping points in the climate system](https://www.pnas.org/doi/10.1073/pnas.2103081118), *PNAS* 118(34): e2103081118. Email on the paper: [email protected]. - Built the META 2021 meta-analytic integrated assessment model ([code](https://github.com/openmodels/META-2021)) covering all eight tipping points then in the economics literature: permafrost carbon, ocean methane hydrates, Arctic summer sea ice, the Amazon, the Greenland and West Antarctic ice sheets, the AMOC and the Indian monsoon. - Main results: tipping points raise the expected social cost of carbon by 24.5% (median 18.8%); "~10% chance of climate tipping points more than doubling the SCC"; largest effects from ocean methane hydrates (+13.1%) and permafrost (+8.4%); "Most of our numbers are probable underestimates". - Lomborg cites the paper's ~25% on his NetZeroCostBenefit.com objections page and in a Nov 14, 2026 myth card, without the tail risk; see the [[Authors/@BjornLomborg/Post Analyses/Post Analysis - BjornLomborg on the Myth That Climate Economists Ignore Tipping Points (2026-11-14)|Nov 14, 2026 tipping-points analysis]]. - Also known for work on the Stern Review and climate risk and on discounting ⚠️ (title and affiliations from the paper and memory; not re-checked this run). Related: [[Authors/@BjornLomborg/People/Nicholas Stern|Nicholas Stern]], [[Authors/@BjornLomborg/People/Richard Tol|Richard Tol]].