Author Archives: Andy May

The Mysterious AR6 ECS, Part 3, What is Climate Sensitivity?

By Andy May Christian Freuer has translated this post to German here. In part one we discussed various estimates of climate sensitivity (ECS, TCR, and observation-based values) and what they mean, especially those reported in the latest IPCC report, AR6. In part 2 we discussed the uncertainty in estimating cloud feedback to surface warming, andContinue reading “The Mysterious AR6 ECS, Part 3, What is Climate Sensitivity?”

The Mysterious AR6 ECS, Part 2, the Impact of Clouds

By Andy May Christian Freuer has translated this post to German here. The yearly net impact of clouds on outgoing and incoming radiation varies over one W/m2 from year-to-year, according to CERES satellite data.[1] AR6 tells us that cloud feedbacks, to GHG surface warming, are the largest source of uncertainty in their assessment of theContinue reading “The Mysterious AR6 ECS, Part 2, the Impact of Clouds”

The Mysterious AR6 ECS, Part 1

By Andy May Christian Freuer has translated this post to German here. The climate sensitivity to CO2 and other greenhouse gases (GHGs) is arguably the most important number in the climate change debate. AR6[1] claims the sensitivity, which they call “ECS” or the equilibrium climate sensitivity, is three degrees per doubling of CO2, or 3°C/2xCO2Continue reading “The Mysterious AR6 ECS, Part 1”

The error of the mean: a dispute between Gavin Schmidt and Nicola Scafetta

By Andy May You can read this post in German here, courtesy of Christian Freuer. Here we go again, writing on the proper use of statistics in climate science. Traditionally, the most serious errors in statistical analysis are made in the social sciences, with medical papers coming in a close second. Climate science is bitingContinue reading “The error of the mean: a dispute between Gavin Schmidt and Nicola Scafetta”

Past and Present Warming – A Temporal Resolution Issue

By Renee Hannon Christian Freuer has translated this post into German here. This post examines how present global surface temperatures compare to the past 12,000 years during the Holocene interglacial. The AR6 IPCC climate assessment report, Climate Change 2021: The Physical Science Basis, by Working Group 1 states in their Summary for Policymakers section A.2.2: “GlobalContinue reading “Past and Present Warming – A Temporal Resolution Issue”

Koonin wins in Cornell Oxford Style Debate

By Andy May Steve Koonin is still undefeated! The Steamboat Institute hosted a Campus Liberty Tour Oxford style debate at Cornell University on Mar 15, 2023. Drs. Steven Koonin and Robert Socolow debated the resolution: “Climate science compels us to make large and rapid reductions in greenhouse gas emissions.”

Atmospheric water vapor (TPW) and climate change

By Andy May Christian Freuer has translated this post into German here. In the latest IPCC major report, AR6, they report: “a best estimate of equilibrium climate sensitivity of 3°C, with a very likely range of 2°C to 5°C”.[1] They also report that CO2 concentration might control climate change.[2] This estimate includes the laboratory estimateContinue reading “Atmospheric water vapor (TPW) and climate change”

The Holocene Temperature Conundrum

By Andy May This post has been translated in German by Christian Freuer here. As my regular readers know, I’ve been writing about the Holocene, especially Holocene climate, for over ten years. My colleagues, Javier Vinós and Renee Hannon, have also written extensively on this topic. This fills a void left by the IPCC, whichContinue reading “The Holocene Temperature Conundrum”

The test that exonerates CO2

By Javier Vinós This post has been translated into German by Christian Freuer here. Most people don’t have a clear understanding of the greenhouse effect (GHE). It is not complicated to understand, but it is usually not well explained. It is often described as “heat-trapping,” but that is incorrect. Greenhouse gases (GHG) do not trapContinue reading “The test that exonerates CO2”

Holocene CO2 and the earlier IPCC Reports

By Andy May This post has been translated into German by Christian Freuer here. As I noted in my earlier post, “The IPCC AR6 Report Erases the Holocene,” the IPCC does not like to discuss the correlation between CO2 and temperature during the Holocene. It destroys their hypothesis that greenhouse gases and volcanos control Earth’sContinue reading “Holocene CO2 and the earlier IPCC Reports”