Acknowledgement
The author is indebted to CNRS and University of Montpellier for providing access to local facilities in the framework of an Emeritus CNRS Research Director position.
I am also indebted to the Editor-in-Chief of Earth’s Future because he first accepted the submitted version after reviewing but faced complains later on and had to deny the acceptance on the basis of the reports of 5 extra reviewers. As I was not given the chance to reply to reviewer’s reports although many comments and criticisms were disputable, the rejected submission was revised and the point-by-point reply at the origin is available as supplementary file or on e-mail request from readers who would like to appreciate the consistency of the reviewing and of the work.
The author does not have any conflict of interest or specific funding to declare.