Is the science behind today’s climate policies as solid as it seems? In Part 2 of this Climate Debrief interview, Dr. John Dale Dunn joins Angela Wheeler to examine the origins and misapplication of the Linear No-Threshold (LNT) Theory in environmental regulation. Dr. Dunn, a board-certified emergency physician with over 50 years of experience and an inactive attorney with decades in toxicology, epidemiology, and radiation biophysics, challenges the foundational assumptions driving modern climate and environmental policies. He discusses dose-response principles, the problems with population studies, Bradford Hill criteria for causation, and why real toxicology should guide policy instead of precautionary overreach. Topics covered: • Origins of Linear No-Threshold Theory and its impact on regulation • Toxicology vs. epidemiology in policymaking • Human vs. natural CO2 sources and historical climate context • Low-level radiation, thresholds, and potential benefits • Why “gross zero” ambitions mirror flawed LNT thinking