By Andy May Read in German here, courtesy of Christian Freuer. After more than two years of hard work, Marcel Crok, I, and 11 other scientists have finally published our critique of the Intergovernmental Panel on Climate Change (IPCC) sixth report (AR6). The entire book has been extensively peer reviewed and a low-resolution pdf ofContinue reading “A Critique of AR6”
Author Archives: Andy May
The Holocene CO2 Dilemma
Guest Post By Renee Hannon This post evaluates the relationship of global CO2 with regional temperature trends during the Holocene interglacial period. Ice core records show that CO2 is strongly coupled with local Antarctic temperature and slightly lags temperature over the past 800,000 years (Luthi, 2008). Whereas the emphasis has been on CO2 and temperatureContinue reading “The Holocene CO2 Dilemma”
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Open letter to Dr Hoesung Lee, Chair of the IPCC
The following letter was sent to Dr. Lee, the Chair of the IPCC earlier today (May 25th, 2023) by Dr. A.J. (Guus) Berkhout, President of Clintel, Emeritus Professor of Geophysics, and a member of the Royal Netherlands Academy of Arts and Sciences Read in German here, courtesy of Christian Freuer. Professor Dr. Hoesung Lee, ChairContinue reading “Open letter to Dr Hoesung Lee, Chair of the IPCC”
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Is AR6 the worst and most biased IPCC Report?
By Andy May This is the text of my presentation on Tom Nelson’s podcast which can be viewed here. The question and answers start at about 18:15 into the interview. Christian Freuer has translated this post to German here. The first IPCC Physical Science Basis report is called “FAR” and was first published in 1990.Continue reading “Is AR6 the worst and most biased IPCC Report?”
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The Mysterious AR6 ECS, Part 4, converting observations to ECS
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 4, converting observations to ECS”
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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?”
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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”
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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”
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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”
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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”
