Tom Nelson

Erich Schaffer: “Water Vapor Feedback, Part One” | Tom Nelson Pod #395

Tom Nelson

Show Notes

Erich Schaffer argues climate science contains major blunders, chiefly that water vapor cools the planet and provides negative feedback. He explains the greenhouse effect as determined by emission altitude and the adiabatic lapse rate, criticizing older “back radiation” explanations. He claims climate budgets and attribution studies overstate surface emission by assuming Earth’s surface is a blackbody, ignoring water’s non-Lambertian behavior and ~0.91 hemispheric emissivity, which he says inflates the greenhouse effect and misattributes missing radiation to water vapor. He highlights latent heat cooling and contends empirical “proxy” methods used to infer strong positive water-vapor feedback are invalid due to lapse-rate behavior. He concludes climate sensitivity would drop to ~1 K or less.

00:00 Meet Erich Schaffer 01:06 Why Climate Basics Matter 04:52 Greenhouse Effect Explained 07:30 Lapse Rate Physics 10:52 IPCC Definition Shift 12:38 Debunking Back Radiation 16:04 Cloud Window Mistake 19:25 Latent Heat Cooling 20:40 Who Causes Warming 31:04 Reading the Spectrum 33:46 What CO2 Forcing Means 37:03 Deriving 3.7 Wm2 41:41 Water Vapor Feedback Setup 45:35 Models vs Observations 46:57 Empirical Feedback Proxies 51:10 Calculating Feedback From Slopes 54:16 Super Greenhouse Tropics Claim 56:52 Lapse Rate Versus Water Vapor 58:45 Moist Adiabats And Latent Cooling 01:00:58 Clouds Versus Water Vapor Paradox 01:05:21 Water Reflectivity And Polar Amplification 01:09:55 Infrared Emissivity Of Water 01:15:01 Surface Emissions Overstated 01:21:16 Reattributing The Greenhouse Effect 01:28:30 Thought Experiments Removing Water Vapor 01:34:26 Why Regional Proxy Fails 01:40:24 Seasonal Proxy Broken By Inversions 01:44:37 Sluggish Troposphere Explains Slopes 01:49:33 Wrap Up And Next Parts

https://x.com/erich_schaffer https://greenhousedefect.com/ ========= Slides, summaries, references, and transcripts of my podcasts: https://tomn.substack.com/p/podcast-summaries My Linktree: https://linktr.ee/tomanelson1

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