The commentary, authored by researchers at the Max Planck Institute of Geoanthropology, does not contest the right of the IUGS to reject the proposal. Lead author Georg Schäfer is explicit on this point: a proposal can legitimately be rejected, and scientific bodies routinely decline candidate units on well-documented grounds. What concerns the authors is something different and, they argue, more corrosive. No adequate scientific justification for the rejection was ever published, they contend, and serious allegations of procedural inconsistencies remain unaddressed. In their view, the legitimacy of the decision rests not on whether the Anthropocene was approved or declined, but on whether the process that produced the outcome met the standards the geological community itself has established.

The procedural concerns documented in the paper are specific and technical. According to the authors, the evaluation of the Anthropocene Working Group’s proposal was compromised in a fundamental way: the working group was unable to address reviewer comments or make revisions to its submission before a decision was reached. In standard scientific practice, whether in peer review or in formal stratigraphic ratification, the opportunity to respond to criticism and refine a case is considered essential to fair evaluation. Removing that opportunity, the commentary argues, undermines the evidentiary basis on which the final judgment could claim scientific authority. A decision made without the possibility of revision, the authors suggest, is a decision about a document that its own authors could not defend or improve.

Equally troubling, the paper reports, was the voting process itself. The majority of votes cast in the decision were, by the IUGS’s own rules, invalid. In a body whose authority derives from adherence to its established statutes and procedures, an outcome determined substantially by votes that should not have counted presents a genuine problem. The commentary frames this not as a minor administrative slip but as a structural failure: if the rules governing ratification are not applied to the ratification itself, the resulting decision inherits a legitimacy deficit that no amount of subsequent communication can fully repair. The authors emphasize that these are not speculative grievances but documented irregularities that have never been formally resolved in public.

Adding to the concern is the fate of an internal ethics report. According to the commentary, an internal investigation was conducted into the procedural violations surrounding the decision, and the IUGS executive committee did not act upon its findings. That report, the authors note, remains publicly inaccessible. For a decision of this magnitude, one that determines whether the formal geological timescale will or will not recognize humanity’s planetary impact, the withholding of the investigative record strikes the authors as incompatible with the transparency that scientific governance requires. They call on the IUGS to fully disclose the relevant documentation and to submit the decision to an independent procedural review.

The stakes, the authors insist, extend well beyond the internal politics of a scientific union. Professor Jürgen Renn, founding director of the Max Planck Institute of Geoanthropology, argues that the Anthropocene epoch proposal demands transparency and procedural legitimacy precisely because of what it represents. If decisions regarding a humanity-induced planetary crisis can be made behind closed doors, with key documents withheld and public communication vague or contradictory, then geoscience’s capacity to inform societal understanding of Earth system change is diminished. In Renn’s framing, the question is not merely whether geologists label a slice of time correctly, but whether the institutions that steward Earth science can be trusted to communicate honestly with a public facing accelerating environmental change.

That broader significance is easy to underestimate. Since its introduction in 2000, the Anthropocene concept has become one of the most influential ideas in modern science, spreading from the geosciences into culture, law, economics, and the humanities. It has shaped debates about climate policy, biodiversity governance, and legal accountability for environmental harm. Courts, museums, curricula, and international assessments have all absorbed the term. The formal rejection of the Anthropocene as a geological epoch does not erase this influence, but it does create a gap between the scientific formalization of the concept and its social life. How that gap is explained to the public matters, and the commentary suggests that an opaque process makes the explanation harder, not easier.

The technical substance of the rejected proposal deserves attention in its own right. The Anthropocene Working Group spent more than a decade identifying candidate markers for a formal epoch, settling on Lake Crawford in Ontario, Canada, where annually laminated sediments preserve an exceptionally clear record of the mid-twentieth century. Plutonium isotopes from atmospheric weapons testing, fly ash from fossil fuel combustion, and a suite of other anthropogenic signals appear in the lake’s layers with striking synchronicity, offering the kind of globally correlatable boundary marker that stratigraphic classification demands. The working group’s case was, by the standards of formal chronostratigraphy, carefully constructed. That construction, and the years of coring, analysis, and debate behind it, is part of what makes the procedural questions surrounding its rejection so consequential for the researchers who produced it.

The commentary also speaks to a wider tension in contemporary science governance: the boundary between scientific judgment and institutional strategy. The title of the paper, Science or Strategy? The Rejection of the Anthropocene Epoch Demands Transparency, poses the question directly. Was the rejection grounded in a published, defensible scientific assessment of the stratigraphic evidence, or was it shaped by institutional considerations, including discomfort with the societal and political implications of formally declaring a human-dominated epoch? The authors do not claim to answer that question. Their point is that the question cannot be answered at all under current conditions of restricted documentation and unaddressed allegations, and that this unanswerability is itself the problem.

What the researchers are asking for is deliberately modest in mechanism and far-reaching in implication. They want the IUGS to release the documentation relevant to the decision, including the internal ethics report, and to commission an independent review of the procedures that produced the outcome. Such steps would not reopen the question of whether the Anthropocene should be ratified; they would establish whether the process met the union’s own standards. If the review vindicated the decision, the geological community could move forward with confidence. If it identified failures, the union would have the opportunity to correct its practices before the next consequential judgment arrives. Either way, the authors argue, transparency would strengthen rather than weaken the institution. At a moment when public trust in expert institutions is fragile and the stakes of Earth system science have never been higher, the treatment of a single epoch proposal may prove to be a test case for how the geosciences govern themselves in the Anthropocene, whatever the timescale ultimately decides to call it.

Subject of Research: Procedural transparency in the IUGS rejection of the Anthropocene epoch proposal

Article Title: Science or strategy? Researchers call for transparency over the Anthropocene rejection

Article References: Science or strategy? Researchers call for transparency over the Anthropocene rejection. (n.d.). Original publication

Image Credits: AI Generated

DOI: Not provided

Keywords: Anthropocene, IUGS, geology, stratigraphy, procedural transparency, Max Planck Institute of Geoanthropology, Earth's Future, Lake Crawford, scientific governance, epoch proposal, peer review, Earth system science