Other meanings of Anthropocene
Earth science
Anthropocene is a proposed geological epoch defined by significant human impact on Earth’s systems. The term describes a period in which human activity has become a major force in climate, ecosystems, sedimentation, biogeochemical cycles, and the distribution of species.1 It is widely used in Earth science and the humanities, but it has not been formally ratified as a unit of the international geologic time scale; the present official epoch remains the Holocene.5
The Anthropocene names a proposed interval in which humans have become a planet-scale geological force. Atmospheric composition, ocean chemistry, land cover, erosion, sediment transport, and extinction patterns now reflect industrial society alongside natural processes.1 The word was popularized by atmospheric chemist Paul Crutzen and ecologist Eugene Stoermer, who argued that the scale of human influence justified considering a new epoch after the Holocene.1
Its starting point is disputed because different signals mark different histories. Candidates include the beginning of agriculture, early industrialization, the Columbian Exchange, and the sharp post-1950 acceleration in population, energy use, production, and emissions. The debate therefore concerns both a physical boundary in strata and the social history that produced it.
The strongest case for the Anthropocene comes from multiple, mutually reinforcing changes rather than one environmental indicator. Human activities have increased concentrations of carbon dioxide and other greenhouse gases, transformed most ice-free land, altered nitrogen and phosphorus cycles, and redistributed organisms across continents and oceans.2
Geologists also identify potential markers in sediments and ice, including radionuclides from nuclear-weapons testing, novel industrial materials, persistent pollutants, fly ash, concrete, plastics, and abrupt changes in fossil pollen and microfossils.3 The proposed interval is therefore unusually legible in the stratigraphic record, although the global synchronicity and long-term durability of individual signals vary.
The Anthropocene is not an officially established epoch in the international geologic time scale. The International Commission on Stratigraphy and the International Union of Geological Sciences rejected a formal proposal to place its boundary at the mid-twentieth-century radionuclide signal, while retaining the Holocene as the current epoch.5
This decision does not invalidate the term’s scientific usefulness. Geological units require a globally correlatable boundary, a suitable reference section, and agreement about rank and evidence; the formal proposal failed to secure the required vote. Researchers may still use Anthropocene as an informal Earth-system concept, a stratigraphic discussion, or a framework for studying human-driven planetary change.
The Anthropocene debate contains several less familiar distinctions. “Anthropogenic” change is not necessarily evidence for a new epoch: humans have modified environments for millennia, but a geological epoch requires a sufficiently coherent and durable signal in strata. The Great Acceleration after about 1950 is influential because many global indicators rise sharply together, yet it can obscure earlier colonialism, plantation agriculture, industrialization, and uneven responsibility among regions.4
The concept also has a technical edge case: no single marker captures every human impact. Nuclear fallout is globally near-synchronous, while plastics, dams, urban sediments, and biological invasions have different geographic distributions. For that reason, Anthropocene research spans stratigraphy, paleoclimatology, ecology, archaeology, economics, and environmental history rather than belonging to geology alone.
The term remains widely used as an informal scientific and interdisciplinary designation, although the proposed epoch was not added to the formal international geologic time scale.
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