The Anthropocene Epoch Proposal Rejected

In a landmark decision that reverberated through the scientific community in March 2024, geologists officially voted against declaring the “Anthropocene” as a distinct geological epoch. While the term has become a buzzword in pop culture and climate activism to describe the age of human impact, the International Union of Geological Sciences (IUGS) ratified a vote that keeps us firmly in the Holocene Epoch. This decision concludes nearly 15 years of debate regarding whether human activity has altered the Earth’s crust enough to warrant a formal rewriting of the geologic time scale.

The Details of the Vote

The rejection was not a casual dismissal but the result of a rigorous and highly technical voting process. The proposal was spearheaded by the Anthropocene Working Group (AWG), a panel of scientists who argued that the rapid industrialization following World War II left an indelible mark on the planet’s geology.

However, the proposal faced its first major hurdle at the Subcommission on Quaternary Stratigraphy (SQS). This body is responsible for the formal definitions of the most recent geological periods. The SQS members voted 12 to 4 against the proposal, with two abstentions.

Despite some internal friction and arguments regarding the validity of the voting procedure, the executive committee of the IUGS—the supreme authority on geological standards—unanimously upheld the vote. This finalized the decision: the Anthropocene will not be added to the International Chronostratigraphic Chart alongside the Jurassic or the Cambrian periods.

The Controversy of the "Golden Spike"

To define a new geological epoch, scientists must identify a Global Boundary Stratotype Section and Point (GSSP), often called a “golden spike.” This is a specific physical location where rock or sediment layers clearly show a simultaneous, worldwide change.

The AWG selected Crawford Lake in Ontario, Canada, as their golden spike. The sediments at the bottom of this deep lake are exceptionally preserved and show distinct layers containing plutonium isotopes from nuclear weapons testing in the early 1950s. The proposal sought to set the start date of the Anthropocene to 1952 based on this radioactive signature.

The geologists who voted “no” did not deny the evidence found in Crawford Lake. Instead, they argued that a single date in 1952 is too narrow. Human impact on the Earth—such as agriculture, deforestation, and carbon emissions—has been happening for thousands of years. Reducing this long, complex history to a single spike in the mid-20th century was viewed by many stratigraphers as scientifically restrictive.

Why "Epoch" Was the Wrong Label

The core of the disagreement was never about whether humans are changing the planet. Almost all geologists involved agree that humanity has become a geological force. The debate was strictly about nomenclature and the rules of stratigraphy (the study of rock layers).

Geological epochs, like the Pleistocene or Eocene, usually span millions of years. They are defined by the slow accumulation of rock and fossils. The Holocene, our current epoch, began roughly 11,700 years ago after the last major ice age.

Opponents of the Anthropocene proposal argued that the timeframe was simply too short. Seventy years (from 1952 to present) represents less than a blink of an eye in geological time. It creates a sediment layer that is merely a few centimeters thick in most places, which is insufficient for the broad classification of an “Epoch.”

A Geological Event, Not an Epoch

Following the rejection, many prominent geologists have suggested a more accurate way to categorize human impact: an “Event.”

In geology, an event is a loosely defined term that can encompass distinct transformations without requiring rigid start dates or golden spikes. Examples include:

• The Great Oxidation Event: When oxygen first accumulated in the atmosphere 2.4 billion years ago.
• The Cambrian Explosion: A period of rapid evolutionary diversification.

classifying the Anthropocene as an event acknowledges the massive, transformative changes humans are causing (mass extinction, climate change, plastic pollution) without forcing it into the strict constraints of the Geological Time Scale. This allows scientists to study the cumulative impact of humanity over thousands of years rather than focusing only on the post-1950s atomic age.

Frequently Asked Questions

Does this vote mean scientists deny climate change? No. The vote was strictly about geological definitions and rock layers. The geologists involved fully acknowledge that humans are altering the climate, biodiversity, and the physical surface of the Earth. They simply decided that “Epoch” was the wrong technical category for these changes.

Are we still in the Holocene? Yes. Officially, we remain in the Meghalayan Age of the Holocene Epoch, which began approximately 4,200 years ago.

Can the decision be appealed? Under the current rules of the International Union of Geological Sciences, a rejected proposal cannot be resubmitted for ten years. This means the debate is effectively settled for the next decade.

Will the word “Anthropocene” stop being used? Likely not. The term has widespread usage in anthropology, history, and environmental science. It remains a useful concept to describe the current state of the world, even if it does not appear on the official chart of geologic time.