Author Archives: Andy May

Understanding the role of the sun in climate change

By Nicola Scafetta Although the sun provides nearly all the energy needed to warm the planet, its contribution to climate change remains widely questioned. Many empirically based studies claim that it has a significant effect on climate, while others (often based on computer global climate simulations) claim that it has a small effect.

My CO2 Presentation to Clintel

The presentation was given to the public at the beautiful Hotel Villa Flora in Hillegom, Netherlands, on June 20, 2023. It was organized by Marcel Crok, director of Clintel. You can watch the whole presentation on “Are fossil-fuel CO2 emissions good or bad?” here. I discussed the 2016 debate between Professor David Karoly, Professor ofContinue reading “My CO2 Presentation to Clintel”

Solar Activity: Cycle 25 Surpasses Cycle 24

By Javier Vinós Over the past two decades, solar activity has been characterized by an extended solar minimum spanning two solar cycles, known as the Clilverd Minimum. This phenomenon is currently affecting the climate, but before we can understand its impact, we must address the significant discrepancy between the solar effects observed in paleoclimate proxyContinue reading “Solar Activity: Cycle 25 Surpasses Cycle 24”

A Twitter Debate on Clintel’s IPCC AR6 Critique

By Andy May In May 2023, Clintel published a book (see figure 1) criticizing AR6 (IPCC, 2021), a publication that was supposed to summarize climate science research to date. We found that AR6 was biased in its reporting of recent developments in climate science, and they ignored published research contrary to their narrative that humansContinue reading “A Twitter Debate on Clintel’s IPCC AR6 Critique”

A Critique of AR6

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”

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”

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”

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?”

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”

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?”