Anthropocene

Anthropocene
Data: Marc Imhoff/NASA GSFC, Christopher Elvidge/NOAA NGDC; Image: Craig Mayhew · Public domain · source
Name	Anthropocene
Caption	Global human influence on Earth's systems
Type	Proposed geological epoch
Start	Various proposed dates (Holocene–present)
Formalization	Under consideration by International Commission on Stratigraphy

Anthropocene The Anthropocene denotes a proposed geological epoch highlighting profound global changes to Earth's systems driven by Industrial Revolution, Fossil fuel combustion, large-scale Agriculture, and rapid Urbanization. Scholars from Paul Crutzen and Eugene Stoermer to researchers at the International Commission on Stratigraphy and the International Geosphere-Biosphere Programme debate its definition, stratigraphy, and formal recognition. The term frames interdisciplinary research across Geology, Paleoclimatology, Ecology, Archaeology, and Environmental history and informs policy discussions at forums like the United Nations Framework Convention on Climate Change.

Definition and Concept

The concept identifies a distinct epoch in the Geologic time scale characterized by persistent anthropogenic alteration of the Atmosphere, Hydrosphere, Biosphere, and Lithosphere, driven by human activities such as Industrial Revolution, Green Revolution, Deforestation, Mining, and Plastic pollution. Proponents argue that markers including radionuclide fallout from Nuclear weapons testing, global Greenhouse gas accumulation linked to Fossil fuel use, and widespread Species extinction signal a stratigraphic departure from the Holocene. Critics invoke frameworks from Stratigraphy, Quaternary science, and Philosophy of science to question the conceptual boundaries and normative implications.

Geological Stratigraphy and Formalization

Formalization proceeds through the International Union of Geological Sciences and its International Commission on Stratigraphy, where working groups such as the Anthropocene Working Group assess candidate Global Boundary Stratotype Section and Point (GSSP) localities and proxies like radioisotopes and microplastics. The committee evaluates proposals against criteria used for epochs like the transition from the Pleistocene to the Holocene and the recognition processes applied in cases such as the Renne et al. chronostratigraphic revisions. Geological bodies including the Geological Society of America and national surveys (e.g., United States Geological Survey, British Geological Survey) contribute stratigraphic data, while museums like the Natural History Museum, London curate archival material.

Human Drivers and Environmental Impacts

Major drivers discussed include the Industrial Revolution innovations (steam engine, railways), globalized Trade networks exemplified by the Columbian exchange, intensification from the Green Revolution, and energy systems reliant on Coal, Oil, and Natural gas. Consequences span accelerated Climate change from elevated Carbon dioxide and Methane concentrations, ocean acidification and deoxygenation affecting regions like the Coral Triangle, mass landscape transformation via Agriculture and Urbanization observed in megacities such as Shanghai and São Paulo, and biodiversity loss documented in assessments by the Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services.

Temporal Boundaries and Proposed Start Dates

Scholars propose varied start dates: early anthropogenic hypotheses tie changes to Neolithic Revolution agriculture and irrigation in regions like the Fertile Crescent; some archaeologists cite the rise of Bronze Age metallurgy and the expansion of civilizations such as Roman Empire land use; other proposals center on the Industrial Revolution in late-18th-century Britain; a widely discussed mid-20th-century "Great Acceleration" hypothesis anchors the epoch to post‑World War II socioeconomic shifts, the onset of global Nuclear weapons testing in the 1940s–1950s, and demographic trends tracked by the United Nations.

Evidence and Stratigraphic Markers

Key stratigraphic proxies include radionuclide signatures from Nuclear weapons testing (e.g., plutonium isotopes), abrupt increases in atmospheric Carbon dioxide and Methane recorded in ice cores from sites like Vostok Station and Law Dome, synchronous global deposition of Spheroidal carbonaceous particles, ubiquitous Microplastic strata, altered sedimentation patterns near major river deltas such as the Ganges-Brahmaputra Delta, and biotic signals including accelerated species introductions documented in regions like the Hawaiian Islands. Geochemical anomalies, heavy metal concentrations from Mining and Smelting (e.g., lead, mercury), and stable isotope shifts in marine and terrestrial archives supplement the record.

Debates, Criticism, and Alternatives

Debates address whether anthropogenic signals meet the stratigraphic requirements for a formal epoch, with critics from Quaternary Research and some Geological Society quarters arguing for improved temporal resolution and clearer GSSP candidates. Philosophical and sociopolitical critiques—raised by scholars affiliated with institutions like Cambridge University, University of Oxford, Harvard University, and Stanford University—contest the epoch's homogenizing framing, propose alternatives such as the "Capitalocene" advanced by thinkers around Jason W. Moore and Donna Haraway's "Chthulucene", or favor returning to a nuanced Holocene subdivision. Debates extend to ethical and legal scholars at bodies like the International Law Commission regarding stewardship and intergenerational equity.

Implications for Policy and Society

Recognition of the epoch influences international governance agendas at the United Nations Environment Programme, climate policy under the United Nations Framework Convention on Climate Change, biodiversity targets set by the Convention on Biological Diversity, and regional planning by agencies including the European Commission and Asian Development Bank. It shapes narratives in conservation programs by the World Wide Fund for Nature and IUCN, informs cultural heritage work at the UNESCO World Heritage Centre, and affects public communication strategies employed by media outlets like the BBC and The New York Times. Legal scholars and policymakers debate regulatory responses spanning fossil fuel phaseouts, urban design promoted by organizations like C40 Cities Climate Leadership Group, and mechanisms for planetary stewardship.

Category:Geology Category:Environmental science Category:Earth systems science