Crawford Lake is a small lake in Ontario, Canada, where the water hardly moves at all. It remains motionless enough for its sediment layers to accumulate in distinct, readable annual bands that date back hundreds of years, much like tree rings. In 2023, scientists determined that it was the most likely to physically signal the start of a new era in Earth’s history.
Traces of plutonium, transported there by winds after hydrogen bomb tests in the 1950s, are buried in those silent layers. The fact that the most obvious proof of human dominance over the planet can be found in one of its most unaltered areas is an odd, almost poetic detail.
| Topic | The Anthropocene Epoch |
|---|---|
| Term Origin | Coined informally by biologist Eugene F. Stoermer in the 1980s; popularized by atmospheric chemist Paul J. Crutzen in 2000 |
| Proposed Definition | A new geological epoch following the Holocene, defined by dominant human impact on Earth’s systems |
| Proposed Start Date | Debated — ranging from 12,000 years ago (Neolithic Revolution) to 1950 (post-WWII Great Acceleration) |
| Formal Status | Rejected in 2024 by the International Commission on Stratigraphy (ICS) and the International Union of Geological Sciences (IUGS) |
| Key Working Group | Anthropocene Working Group (AWG), Subcommission on Quaternary Stratigraphy |
| Proposed GSSP Site | Crawford Lake, Ontario, Canada (sediments showing plutonium spike from nuclear tests, 1950s) |
| Key Markers Studied | Radioactive nuclei, microplastics, carbon particles, heavy metals, nitrates |
| Current Epoch | Holocene (began approximately 11,500 years ago) |
| Reference Website | Natural History Museum — What is the Anthropocene? |
For you, that is the Anthropocene. The concept itself is easy to understand. Because of how drastically humans have altered the planet’s atmosphere, oceans, soil, and species, some scientists have argued that we have effectively ended one geological epoch and begun a new one. They dubbed it the Anthropocene, which is Greek for “human” and “new.” The idea really took off in 2000 when Nobel Prize-winning chemist Paul Crutzen abruptly declared that we were no longer in the Holocene during a conference, apparently out of frustration. There was silence in the room. The concept remained.
It had been a successful Holocene. A climate that was calm enough for civilizations to flourish and warm enough for agriculture for about 11,500 years. In it, humans thrived. Then, at some point, people started eating it. The question of precisely when is both genuinely fascinating and, depending on who you ask, frustrating.
The Neolithic Revolution, when farming started significantly altering the land, is cited by some researchers. Others focus on the Industrial Revolution, when Britain’s smokestacks in the eighteenth century released carbon dioxide into the atmosphere at levels not seen in millions of years. A sizable portion came to the conclusion that 1950 marked the start of the so-called Great Acceleration, which saw a synchronized lurch forward in resource extraction, pollution, industrial output, and population growth.
The data makes it difficult to ignore the fact that the post-World War II decades actually changed the planet. In less than a human lifetime, radioactive fallout from nuclear tests rained down on the world, embedding itself into rock, ice, and soil; carbon dioxide emissions bent sharply upward; and ocean plastic appeared where none had previously existed. For a very long time, the geological record will reveal a calling card left by the Atomic Age. That isn’t a metaphor. Stratigraphy is that.
The Anthropocene Working Group formally submitted their proposal—Crawford Lake sediments, 1950 start date, plutonium as the golden spike—after about fifteen years of discussion. The International Commission on Stratigraphy then rejected it in early 2024. It was 12 to 4. The reasons were technical: the boundaries were too hard to define in a geological context, the sedimentary record was too shallow, and the suggested start date was too recent.
The fact that human impact did not occur everywhere at once is one of the main issues. The Americas’ deforestation developed in a different way than Europe’s industrialization. Critics claimed that pinpointing a single global start date oversimplifies a highly uneven situation.
Even though some people were disappointed, there is a good argument to be made that the rejection was the correct decision from a scientific standpoint. Geological epochs, which span tens of thousands to millions of years and are characterized by changes in the planet’s rock layers, are very important. By those standards, setting one off with six decades of human activity—no matter how dramatic—is a stretch. The geologists who voted against it did not downplay plastic pollution or deny climate change. They insisted on being rigorous and refusing to let urgency take precedence over accuracy.
However, the IUGS itself recognized something crucial in its official statement after the rejection: the term “Anthropocene” is here to stay. Scientists, decision-makers, economists, and the general public will continue to use it because it accurately describes something that no other term can. It is more than just a timestamp; it describes a condition, a planetary situation. At least in terms of the timescale that humans can truly understand, the Earth has undergone changes that feel fundamentally different from anything that came before.
It’s still unclear if future generations will view this time as a hinge point that is clearly visible in the rock, similar to how we view the end of the last ice age. However, when you stroll along a plastic-tangled shoreline or gaze at satellite photos of city lights burning through the night across continents, the fundamental question seems resolved. The age of human dominance has been going on for some time, whether or not it has a formal geological designation. The still water of Crawford Lake is aware of this. The sediment is truthful.
