Front cover and part of the prelims:
Full volume:
Preface:
I have compiled all Climath posts and comments from the last year (2025) into this book-sized volume of more than 300 pages. As Climath began on 21 November 2024, the volume also contains the initial posts, those from late 2024.
I undertook this endeavour for several reasons, including my perception that:
Compiling past information helps us to recall the past and reevaluate the correctness or incorrectness of the thoughts we presented.
Gathering the fragmented information from websites in a traditional book volume offers some advantages, at least for traditional readers.
A book can be much more resilient to future censorship or silencing attacks, which are quite probable. It can easily be converted into a print form and, even in electronic form, it can be saved in multiple places. Hence, I am archiving this volume on multiple sites, including Climath and Itia.
To clarify the latter threat, I am offering the following example: In one of my Climath posts (here reproduced as the section “Twelve replies to comments on my last climate paper”), I praised the ResearchGate platform for enabling the archiving of research items or discussions about them, and for not censoring these items or the comments on them. Soon after my post (as I detail in an update of it), ResearchGate not only discontinued the commenting feature, but also erased all existing comments, without notification. And it is hard to lose intellectual property, even if it is published informally.
I am grateful to Substack for offering me the opportunity to share my ideas and thoughts on its platform, and to discuss them with colleagues, while assigning me the copyright ownership. But I will refrain from further praise, given the experience from other platforms as above, and the global tendency towards authoritarianism, as articulated in several of the posts contained in this volume. Substack seems to align with this tendency as it clearly states this: “Substack is free to terminate (or suspend access to) your use of Substack, or your account, for any reason at our discretion.”
Initially I thought it would be easy to create this compilation. I consulted an AI bot that promised to help me automate the procedure. However, after wasting several hours chatting with the bot, I found that the programs it suggested and the software components it prompted me to install resulted in total failure. In the end, I did everything manually. I believe I have been faithful to the original posts, here represented as sections, including the structure, the spelling and the hyperlinks. However, to avoid confusion among the sections, I renumbered the footnotes with a uniform numbering system for the entire volume.
I am indebted to all contributors, listed on the previous page, and the readers who visited Climath giving it the rather satisfactory statistical performance shown on the following pages.
My plan for 2026 is to continue posting on Climath and, hopefully, to produce another volume with the entries of 2026.
Athens 2026-01-12
Demetris Koutsoyiannis
UPDATE 2026-01-19: Also posted in Clintel’s site.
On another issue. BOSCHAT ET AL.
Covariability in Large-Scale Climate Modes: Implications for Australian (2026) may be of interest.
Precipitation Variability. This study explicitly decomposes ENSO, IOD, and SAM into independent principal components to quantify their predictive contribution to Australian precipitation. PCA forces orthogonality (statistical independence) between components, and the subsequent prediction framework assumes these independent components drive precipitation variability.
Thanks for taking the time to do everything manually Demetris.
More people need to understand the value of physical formats.
You are a champion.