Антропоцен дәуірі: Жаңа геологиялық эпоха талқылауы

Proposed geologic epoch for present time

The Anthropocene ('/æ//n//θ//r//ə//p//ə/,/s//iː//n//, //æ//n/'/θ//r//ɒ//p//ə// / ) is the common name for a proposed geological epoch, dating from the commencement of significant human impact on Earth up to the present day. It affects Earth's geology, landscape, limnology, ecosystems and climate. The effects of human activities on Earth can be seen for example in biodiversity loss and climate change. Various start dates for the Anthropocene have been proposed, ranging from the beginning of the Neolithic Revolution (12,000–15,000 years ago), to as recently as the 1960s as a starting date. In May 2019, the Anthropocene Working Group (AWG) voted in favour of submitting a formal proposal to the International Commission on Stratigraphy (ICS) by 2021. The proposal located potential stratigraphic markers to the mid 20th century. This time period coincides with the start of the Great Acceleration, a post World War II time period during which global population growth, pollution and exploitation of natural resources have all increased at a dramatic rate. The Atomic Age also started around the mid 20th century, when the risks of nuclear wars, nuclear terrorism and nuclear accidents increased. The Anthropocene Working Group of the Subcommission on Quaternary Stratigraphy (SQS) of the ICS voted in April 2016 to proceed towards a formal golden spike (GSSP) proposal to define the Anthropocene epoch in the geologic time scale. The group presented the proposal to the International Geological Congress in August 2016. Twelve candidate sites were selected for the GSSP; the sediments of Crawford Lake, Canada were finally proposed, in July 2023, to mark the lower boundary of the Anthropocene, starting with the Crawfordian stage/age in 1950. In March 2024, after 15 years of deliberation, the Anthropocene Epoch proposal of the AWG was voted down by a wide margin by the SQS, owing largely to its shallow sedimentary record and extremely recent proposed start date. The ICS and the International Union of Geological Sciences (IUGS) later formally confirmed, by a near unanimous vote, the rejection of the AWG's Anthropocene Epoch proposal for inclusion in the Geologic Time Scale. The IUGS statement on the rejection concluded: "Despite its rejection as a formal unit of the Geologic Time Scale, Anthropocene will nevertheless continue to be used not only by Earth and environmental scientists, but also by social scientists, politicians and economists, as well as by the public at large. It will remain an invaluable descriptor of human impact on the Earth system." Paul J. Crutzen re invented and popularised the term. Scientists in the Soviet Union appear to have used the term Anthropocene as early as the 1960s to refer to the Quaternary, the most recent geological period. Ecologist Eugene F. Stoermer subsequently used Anthropocene with a different sense in the 1980s and the term was widely popularised in 2000 by atmospheric chemist Paul J. Crutzen, who regards the influence of human behavior on Earth's atmosphere in recent centuries as so significant as to constitute a new geological epoch. The term Anthropocene is informally used in scientific contexts. The Geological Society of America entitled its 2011 annual meeting: Archean to Anthropocene: The past is the key to the future. The new epoch has no agreed start date, but one proposal, based on atmospheric evidence, is to fix the start with the Industrial Revolution 1780, with the invention of the steam engine. Other scientists link the new term to earlier events, such as the rise of agriculture and the Neolithic Revolution (around 12,000 years BP). Evidence of relative human impact – such as the growing human influence on land use, ecosystems, biodiversity, and species extinction – is substantial; scientists think that human impact has significantly changed (or halted) the growth of biodiversity. Those arguing for earlier dates posit that the proposed Anthropocene may have begun as early as 14,000–15,000 years BP, based on geologic evidence; this has led other scientists to suggest that "the onset of the Anthropocene should be extended back many thousand years"; this would make the Anthropocene essentially synonymous with the current term, Holocene.

In 2008, the Stratigraphy Commission of the Geological Society of London considered a proposal to make the Anthropocene a formal unit of geological epoch divisions. In January 2015, 26 of the 38 members of the International Anthropocene Working Group published a paper suggesting the Trinity test on 16 July 1945 as the starting point of the proposed new epoch. However, a significant minority supports one of several alternative dates. Other scholars point to the diachronous character of the physical strata of the Anthropocene, arguing that onset and impact are spread out over time, not reducible to a single instant or date of start. A January 2016 report on the climatic, biological, and geochemical signatures of human activity in sediments and ice cores suggested the era since the mid 20th century should be recognised as a geological epoch distinct from the Holocene. The Anthropocene Working Group met in Oslo in April 2016 to consolidate evidence supporting the argument for the Anthropocene as a true geologic epoch. Evidence was evaluated and the group voted to recommend Anthropocene as the new geological epoch in August 2016. In April 2019, the Anthropocene Working Group (AWG) announced that they would vote on a formal proposal to the International Commission on Stratigraphy, to continue the process started at the 2016 meeting. Possible markers include microplastics, heavy metals, or radioactive nuclei left by tests from thermonuclear weapons. In November 2021, an alternative proposal that the Anthropocene is a geological event, not an epoch, was published and later expanded in 2022. This challenged the assumption underlying the case for the Anthropocene epoch the idea that it is possible to accurately assign a precise date of start to highly diachronous processes of human influenced Earth system change. The argument indicated that finding a single GSSP would be impractical, given human induced changes in the Earth system occurred at different periods, in different places, and spread under different rates. Under this model, the Anthropocene would have many events marking human induced impacts on the planet, including the mass extinction of large vertebrates, the development of early farming, land clearance in the Americas, global scale industrial transformation during the Industrial Revolution, and the start of the Atomic Age. The authors are members of the AWG who had voted against the official proposal of a starting date in the mid 20th century, and sought to reconcile some of the previous models (including Ruddiman and Maslin proposals). They cited Crutzen's original concept, arguing that the Anthropocene is much better and more usefully conceived of as an unfolding geological event, like other major transformations in Earth's history such as the Great Oxidation Event. In July 2023, the AWG chose Crawford Lake in Ontario, Canada as a site representing the beginning of the proposed new epoch. The sediment in that lake shows a spike in levels of plutonium from hydrogen bomb tests, a key marker the group chose to place the start of the Anthropocene in the 1950s, along with other elevated markers including carbon particles and nitrates from the burning of fossil fuels and widespread application of chemical fertilizers respectively. Had it been approved, the official declaration of the new Anthropocene epoch would have taken place in August 2024, and its first age may have been named Crawfordian after the lake.

In March 2024, the New York Times reported on the results of an internal vote held by the IUGS, finding that after nearly 15 years of debate, the proposal to ratify the Anthropocene had been defeated by a 12 to 4 margin, with 2 abstentions. These results were not out of a dismissal of human impact on the planet, but rather an inability to constrain the Anthropocene in a geological context; the widely adopted 1950 start date was found to prone to recency bias and to overshadow earlier examples of human impacts, many of which happened in different parts of the world at different times. Although the proposal could be raised again, this would require the entire process of debate to start from the beginning. The Intergovernmental Panel on Climate Change takes the pre industrial era (chosen as the year 1750) as the baseline related to changes in long lived, well mixed greenhouse gases. Although it is apparent that the Industrial Revolution ushered in an unprecedented global human impact on the planet, much of Earth's landscape already had been profoundly modified by human activities. The human impact on Earth has grown progressively, with few substantial slowdowns. A 2024 scientific perspective paper authored by a group of scientists led by William J. Ripple proposed the start of the Anthropocene around 1850, stating it is a "compelling choice . from a population, fossil fuel, greenhouse gasses, temperature, and land use perspective."

In May 2019 the twenty nine members of the Anthropocene Working Group (AWG) proposed a start date for the Epoch in the mid 20th century, as that period saw "a rapidly rising human population accelerated the pace of industrial production, the use of agricultural chemicals and other human activities. At the same time, the first atomic bomb blasts littered the globe with radioactive debris that became embedded in sediments and glacial ice, becoming part of the geologic record." The official start dates, according to the panel, would coincide with either the radionuclides released into the atmosphere from bomb detonations in 1945, or with the Limited Nuclear Test Ban Treaty of 1963.

The peak in radionuclides fallout consequential to atomic bomb testing during the 1950s is another possible date for the beginning of the Anthropocene (the detonation of the first atomic bomb in 1945 or the Partial Nuclear Test Ban Treaty in 1963). As early as 1873, the Italian geologist Antonio Stoppani acknowledged the increasing power and effect of humanity on the Earth's systems and referred to an 'anthropozoic era'.

Changes in drainage patterns traceable to human activity will persist over geologic time in large parts of the continents where the geologic regime is erosional. This involves, for example, the paths of roads and highways defined by their grading and drainage control. Direct changes to the form of the Earth's surface by human activities (quarrying and landscaping, for example) also record human impacts. It has been suggested that the deposition of calthemite formations exemplify a natural process which has not previously occurred prior to the human modification of the Earth's surface, and which therefore represents a unique process of the Anthropocene. Calthemite is a secondary deposit, derived from concrete, lime, mortar or other calcareous material outside the cave environment. Calthemites grow on or under man made structures (including mines and tunnels) and mimic the shapes and forms of cave speleothems, such as stalactites, stalagmites, flowstone etc.

Human activities like deforestation and road construction are believed to have elevated average total sediment fluxes across the Earth's surface.

Increases in erosion due to farming and other operations will be reflected by changes in sediment composition and increases in deposition rates elsewhere. In land areas with a depositional regime, engineered structures will tend to be buried and preserved, along with litter and debris. Litter and debris thrown from boats or carried by rivers and creeks will accumulate in the marine environment, particularly in coastal areas, but also in mid ocean garbage patches. Such human created artifacts preserved in stratigraphy are known as "technofossils". Changes in biodiversity will also be reflected in the fossil record, as will species introductions. An example cited is the domestic chicken, originally the red junglefowl Gallus gallus, native to south east Asia but has since become the world's most common bird through human breeding and consumption, with over 60 billion consumed annually and whose bones would become fossilised in landfill sites. Hence, landfills are important resources to find "technofossils".

In terms of trace elements, there are distinct signatures left by modern societies. For example, in the Upper Fremont Glacier in Wyoming, there is a layer of chlorine present in ice cores from 1960's atomic weapon testing programs, as well as a layer of mercury associated with coal plants in the 1980s. From the late 1940s, nuclear tests have led to local nuclear fallout and severe contamination of test sites both on land and in the surrounding marine environment. Some of the radionuclides that were released during the tests are Cs, Sr, Pu, Pu, Am, and I. These have been found to have had significant impact on the environment and on human beings. In particular, Cs and Sr have been found to have been released into the marine environment and led to bioaccumulation over a period through food chain cycles. The carbon isotope C, commonly released during nuclear tests, has also been found to be integrated into the atmospheric CO, and infiltrating the biosphere, through ocean atmosphere gas exchange. Increase in thyroid cancer rates around the world is also surmised to be correlated with increasing proportions of the I radionuclide. The highest global concentration of radionuclides was estimated to have been in 1965, one of the dates which has been proposed as a possible benchmark for the start of the formally defined Anthropocene. Human burning of fossil fuels has also left distinctly elevated concentrations of black carbon, inorganic ash, and spherical carbonaceous particles in recent sediments across the world. Concentrations of these components increases markedly and almost simultaneously around the world beginning around 1950. A useful candidate for holding markers in the geologic time record is the pedosphere. Soils retain information about their climatic and geochemical history with features lasting for centuries or millennia. Human activity is now firmly established as the sixth factor of soil formation. Humanity affects pedogenesis directly by, for example, land levelling, trenching and embankment building, landscape scale control of fire by early humans, organic matter enrichment from additions of manure or other waste, organic matter impoverishment due to continued cultivation and compaction from overgrazing. Human activity also affects pedogenesis indirectly by drift of eroded materials or pollutants. Anthropogenic soils are those markedly affected by human activities, such as repeated ploughing, the addition of fertilisers, contamination, sealing, or enrichment with artefacts (in the World Reference Base for Soil Resources they are classified as Anthrosols and Technosols). An example from archaeology would be dark earth phenomena when long term human habitation enriches the soil with black carbon. Anthropogenic soils are recalcitrant repositories of artefacts and properties that testify to the dominance of the human impact, and hence appear to be reliable markers for the Anthropocene. Some anthropogenic soils may be viewed as the 'golden spikes' of geologists (Global Boundary Stratotype Section and Point), which are locations where there are strata successions with clear evidences of a worldwide event, including the appearance of distinctive fossils. Drilling for fossil fuels has also created holes and tubes which are expected to be detectable for millions of years. The astrobiologist David Grinspoon has proposed that the site of the Apollo 11 Lunar landing, with the disturbances and artifacts that are so uniquely characteristic of our species' technological activity and which will survive over geological time spans could be considered as the 'golden spike' of the Anthropocene. An October 2020 study coordinated by University of Colorado at Boulder found that distinct physical, chemical and biological changes to Earth's rock layers began around the year 1950. The research revealed that since about 1950, humans have doubled the amount of fixed nitrogen on the planet through industrial production for agriculture, created a hole in the ozone layer through the industrial scale release of chlorofluorocarbons (CFCs), released enough greenhouse gasses from fossil fuels to cause planetary level climate change, created tens of thousands of synthetic mineral like compounds that do not naturally occur on Earth, and caused almost one fifth of river sediment worldwide to no longer reach the ocean due to dams, reservoirs and diversions. Humans have produced so many millions of tons of plastic each year since the early 1950s that microplastics are "forming a near ubiquitous and unambiguous marker of Anthropocene". The study highlights a strong correlation between global human population size and growth, global productivity and global energy use and that the "extraordinary outburst of consumption and productivity demonstrates how the Earth System has departed from its Holocene state since c. 1950 CE, forcing abrupt physical, chemical and biological changes to the Earth's stratigraphic record that can be used to justify the proposal for naming a new epoch—the Anthropocene."

Although the validity of Anthropocene as a scientific term remains disputed, its underlying premise, i. e., that humans have become a geological force, or rather, the dominant force shaping the Earth's climate, has found traction among academics and the public. In an opinion piece for Philosophical Transactions of the Royal Society B, Rodolfo Dirzo, Gerardo Ceballos, and Paul R. Ehrlich write that the term is "increasingly penetrating the lexicon of not only the academic socio sphere, but also society more generally", and is now included as an entry in the Oxford English Dictionary. The University of Cambridge, as another example, offers a degree in Anthropocene Studies. In the public sphere, the term Anthropocene has become increasingly ubiquitous in activist, pundit, and political discourses. Some who are critical of the term Anthropocene nevertheless concede that "For all its problems, [it] carries power." The popularity and currency of the word has led scholars to label the term a "charismatic meta category" or "charismatic mega concept." The term, regardless, has been subject to a variety of criticisms from social scientists, philosophers, Indigenous scholars, and others. The anthropologist John Hartigan has argued that due to its status as a charismatic meta category, the term Anthropocene marginalizes competing, but less visible, concepts such as that of "multispecies." The more salient charge is that the ready acceptance of Anthropocene is due to its conceptual proximity to the status quo – that is, to notions of human individuality and centrality. Other scholars appreciate the way in which the term Anthropocene recognizes humanity as a geological force, but take issue with the indiscriminate way in which it does. Not all humans are equally responsible for the climate crisis. To that end, scholars such as the feminist theorist Donna Haraway and sociologist Jason Moore, have suggested naming the Epoch instead as the Capitalocene. Such implies capitalism as the fundamental reason for the ecological crisis, rather than just humans in general. However, according to philosopher Steven Best, humans have created "hierarchical and growth addicted societies" and have demonstrated "ecocidal proclivities" long before the emergence of capitalism. Hartigan, Bould, and Haraway all critique what Anthropocene does as a term; however, Hartigan and Bould differ from Haraway in that they criticize the utility or validity of a geological framing of the climate crisis, whereas Haraway embraces it. In addition to "Capitalocene," other terms have also been proposed by scholars to trace the roots of the Epoch to causes other than the human species broadly. Janae Davis, for example, has suggested the "Plantationocene" as a more appropriate term to call attention to the role that plantation agriculture has played in the formation of the Epoch, alongside Kathryn Yusoff's argument that racism as a whole is foundational to the Epoch. The Plantationocene concept traces "the ways that plantation logics organize modern economies, environments, bodies, and social relations." In a similar vein, Indigenous studies scholars such as Métis geographer Zoe Todd have argued that the Epoch must be dated back to the colonization of the Americas, as this "names the problem of colonialism as responsible for contemporary environmental crisis." Potawatomi philosopher Kyle Powys Whyte has further argued that the Anthropocene has been apparent to Indigenous peoples in the Americas since the inception of colonialism because of "colonialism's role in environmental change." Other critiques of Anthropocene have focused on the genealogy of the concept. Todd also provides a phenomenological account, which draws on the work of the philosopher Sara Ahmed, writing: "When discourses and responses to the Anthropocene are being generated within institutions and disciplines which are embedded in broader systems that act as de facto 'white public space,' the academy and its power dynamics must be challenged." Other aspects which constitute current understandings of the concept of the Anthropocene such as the ontological split between nature and society, the assumption of the centrality and individuality of the human, and the framing of environmental discourse in largely scientific terms have been criticized by scholars as concepts rooted in colonialism and which reinforce systems of postcolonial domination. To that end, Todd makes the case that the concept of Anthropocene must be indigenized and decolonized if it is to become a vehicle of justice as opposed to white thought and domination. The scholar Daniel Wildcat, a Yuchi member of the Muscogee Nation of Oklahoma, for example, has emphasized spiritual connection to the land as a crucial tenet for any ecological movement. Similarly, in her study of the Ladakhi people in northern India, the anthropologist Karine Gagné, detailed their understanding of the relation between nonhuman and human agency as one that is deeply intimate and mutual. For the Ladakhi, the nonhuman alters the epistemic, ethical, and affective development of humans – it provides a way of "being in the world." The Ladakhi, who live in the Himalayas, for example, have seen the retreat of the glaciers not just as a physical loss, but also as the loss of entities which generate knowledge, compel ethical reflections, and foster intimacy. Other scholars have similarly emphasized the need to return to notions of relatedness and interdependence with nature. The writer Jenny Odell has written about what Robin Wall Kimmerer calls "species loneliness," the loneliness which occurs from the separation of the human and the nonhuman, and the anthropologist Radhika Govindrajan has theorized on the ethics of care, or relatedness, which govern relations between humans and animals. Scholars are divided on whether to do away with the term Anthropocene or co opt it.

William Ruddiman has argued that the Anthropocene began approximately 8,000 years ago with the development of farming and sedentary cultures. At that point, humans were dispersed across all continents except Antarctica, and the Neolithic Revolution was ongoing. During this period, humans developed agriculture and animal husbandry to supplement or replace hunter gatherer subsistence. Such innovations were followed by a wave of extinctions, beginning with large mammals and terrestrial birds. This wave was driven by both the direct activity of humans (e. g. hunting) and the indirect consequences of land use change for agriculture. Landscape scale burning by prehistoric hunter gathers may have been an additional early source of anthropogenic atmospheric carbon. Ruddiman also claims that the greenhouse gas emissions in part responsible for the Anthropocene began 8,000 years ago when ancient farmers cleared forests to grow crops. Ruddiman's work has been challenged with data from an earlier interglaciation ("Stage 11", approximately 400,000 years ago) which suggests that 16,000 more years must elapse before the current Holocene interglaciation comes to an end, and thus the early anthropogenic hypothesis is invalid. Also, the argument that "something" is needed to explain the differences in the Holocene is challenged by more recent research showing that all interglacials are different.

Homogenocene (from old Greek: homo , same; geno , kind; kainos , new;) is a more specific term used to define our current epoch, in which biodiversity is diminishing and biogeography and ecosystems around the globe seem more and more similar to one another mainly due to invasive species that have been introduced around the globe either on purpose (crops, livestock) or inadvertently. This is due to the newfound globalism that humans participate in, as species traveling across the world to another region was not as easily possible in any point of time in history as it is today. The term Homogenocene was first used by Michael Samways in his editorial article in the Journal of Insect Conservation from 1999 titled "Translocating fauna to foreign lands: Here comes the Homogenocene." The term was used again by John L. Curnutt in the year 2000 in Ecology, in a short list titled "A Guide to the Homogenocene", which reviewed Alien species in North America and Hawaii: impacts on natural ecosystems by George Cox. Charles C. Mann, in his acclaimed book 1493: Uncovering the New World Columbus Created, gives a bird's eye view of the mechanisms and ongoing implications of the homogenocene.

The concept of the Anthropocene has also been approached via humanities such as philosophy, literature and art. In the scholarly world, it has been the subject of increasing attention through special journals, conferences, and disciplinary reports. The Anthropocene, its attendant timescale, and ecological implications prompt questions about death and the end of civilisation, memory and archives, the scope and methods of humanistic inquiry, and emotional responses to the "end of nature". Some scholars have posited that the realities of the Anthropocene, including "human induced biodiversity loss, exponential increases in per capita resource consumption, and global climate change," have made the goal of environmental sustainability largely unattainable and obsolete. Historians have actively engaged the Anthropocene. In 2000, the same year that Paul Crutzen coined the term, world historian John McNeill published Something New Under the Sun, In 2001, historian of science Naomi Oreskes revealed the systematic efforts to undermine trust in climate change science and went on to detail the corporate interests delaying action on the environmental challenge. Both McNeill and Oreskes became members of the Anthropocene Working Group because of their work correlating human activities and planetary transformation.

In 2019, the English musician Nick Mulvey released a music video on YouTube named "In the Anthropocene". In cooperation with Sharp's Brewery, the song was recorded on 105 vinyl records made of washed up plastic from the Cornish coast. The Anthropocene Reviewed is a podcast and book by author John Green, where he "reviews different facets of the human centered planet on a five star scale". Photographer Edward Burtynsky created "The Anthropocene Project" with Jennifer Baichwal and Nicholas de Pencier, which is a collection of photographs, exhibitions, a film, and a book. His photographs focus on landscape photography that captures the effects human beings have had on the earth. In 2015, the American death metal band Cattle Decapitation released its seventh studio album titled The Anthropocene Extinction. In 2020, Canadian musician Grimes released her fifth studio album titled Miss Anthropocene. The name is also a pun on the feminine title "Miss" and the words "misanthrope" and "Anthropocene."