Climate change and civilizational collapse

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This 1902 article attributes to Swedish Nobel laureate (for chemistry) Svante Arrhenius a theory that coal combustion could eventually lead to a degree of global warming causing human extinction. 19021015 Hint to Coal Consumers - Svante Arrhenius - The Selma Morning Times - Global warming.jpg
This 1902 article attributes to Swedish Nobel laureate (for chemistry) Svante Arrhenius a theory that coal combustion could eventually lead to a degree of global warming causing human extinction.

Climate change and civilizational collapse refers to a hypothetical risk of the impacts of climate change reducing global socioeconomic complexity to the point complex human civilization effectively ends around the world, with humanity reduced to a less developed state. This hypothetical risk is typically associated with the idea of a massive reduction of human population caused by the direct and indirect impacts of climate change, and often, it is also associated with a permanent reduction of the Earth's carrying capacity. Finally, it is sometimes suggested that a civilizational collapse caused by climate change would soon be followed by human extinction.

Contents

Some researchers connect historical examples of societal collapse with adverse changes in local and/or global weather patterns. In particular, the 4.2-kiloyear event, a millennial-scale megadrought which took place in Africa and Asia between 5,000 and 4,000 years ago, has been linked with the collapse of the Old Kingdom in Egypt, the Akkadian Empire in Mesopotamia, the Liangzhu culture in the lower Yangtze River area and the Indus Valley Civilization. [2] [3] In Europe, the General Crisis of the Seventeenth Century, which was defined by events such as crop failure and the Thirty Years' War, took place during the Little Ice Age. In 2011, a general connection was proposed between adverse climate variations and long-term societal crises during the preindustrial times. [4] However, all of these events were limited to individual human societies: a collapse of the entire human civilization would be historically unprecedented.

Some of the more extreme warnings of civilizational collapse caused by climate change, such as a claim that civilization is highly likely to end by 2050, have attracted strong rebutals from scientists. [5] [6] The 2022 IPCC Sixth Assessment Report projects that human population would be in a range between 8.5 billion and 11 billion people by 2050. By the year 2100, the median population projection is at 11 billion people, while the maximum population projection is close to 16 billion people. The lowest projection for 2100 is around 7 billion, and this decline from present levels is primarily attributed to "rapid development and investment in education", with those projections associated with some of the highest levels of economic growth. [7] However, a minority[ citation needed ] of climate scientists have argued that higher levels of warming—between about 3 °C (5.4 °F) to 5 °C (9.0 °F) over preindustrial temperatures—may be incompatible with civilization, or that the lives of several billion people could no longer be sustained in such a world. [8] [9] [10] [11] In 2022, they have called for a so-called "climate endgame" research agenda into the probability of these risks, which had attracted significant media attention and some scientific controversy. [12] [13] [14]

Some of the most high-profile writing on climate change and civilizational collapse has been written by non-scientists. Notable examples include "The Uninhabitable Earth" [15] by David Wallace-Wells and "What if we stopped pretending?" by Jonathan Franzen, [16] which were both criticized for scientific inaccuracy. [17] [18] Climate change in popular culture is commonly represented in a highly exaggerated manner as well. Opinion polling has provided evidence that people across the world believe that the outcomes of civilizational collapse or human extinction are much more likely than the scientists believe them to be. [19] [20]

Suggested historical examples

This section is an excerpt from Societal collapse § Natural disasters and climate change.[ edit ]

Archeologists have identified signs of a megadrought which lasted for a millennium between 5,000 and 4,000 years ago in Africa and Asia. The drying of the Green Sahara not only turned it into a desert but also disrupted the monsoon seasons in South and Southeast Asia and caused flooding in East Asia, which prevented successful harvests and the development of complex culture. It coincided with and may have caused the decline and the fall of the Akkadian Empire in Mesopotamia and the Indus Valley Civilization. [21] The dramatic shift in climate is known as the 4.2-kiloyear event. [22]

The highly advanced Indus Valley Civilization took root around 3000 BC in what is now northwestern India and Pakistan and collapsed around 1700 BC. Since the Indus script has yet to be deciphered, the causes of its de-urbanization [23] remain a mystery, but there is some evidence pointing to natural disasters. [24] Signs of a gradual decline began to emerge in 1900 BC, and two centuries later, most of the cities had been abandoned. Archeological evidence suggests an increase in interpersonal violence and in infectious diseases like leprosy and tuberculosis. [25] [26] Historians and archeologists believe that severe and long-lasting drought and a decline in trade with Egypt and Mesopotamia caused the collapse. [27] Evidence for earthquakes has also been discovered. Sea level changes are also found at two possible seaport sites along the Makran coast which are now inland. Earthquakes may have contributed to decline of several sites by direct shaking damage or by changes in sea level or in water supply. [28] [29] [30]

More generally, recent research pointed to climate change as a key player in the decline and fall of historical societies in China, the Middle East, Europe, and the Americas. In fact, paleoclimatogical temperature reconstruction suggests that historical periods of social unrest, societal collapse, and population crash and significant climate change often occurred simultaneously. A team of researchers from Mainland China and Hong Kong were able to establish a causal connection between climate change and large-scale human crises in pre-industrial times. Short-term crises may be caused by social problems, but climate change was the ultimate cause of major crises, starting with economic depressions. [31] Moreover, since agriculture is highly dependent on climate, any changes to the regional climate from the optimum can induce crop failures. [32]

The Mongol conquests corresponded to a period of cooling in the Northern Hemisphere between the thirteenth and fourteenth centuries, when the Medieval Warm Period was giving way to the Little Ice Age, which caused ecological stress. In Europe, the cooling climate did not directly facilitate the Black Death, but it caused wars, mass migration, and famine, which helped diseases spread. [32]

Modern discussion

2000s

As early as in 2004, a book titled Ecocriticism explored the connection between apocalypticism as expressed in religious contexts, and the secular apocalyptic interpretations of climate and environmental issues. [33] It argued that the tragic (preordained, with clearly delineated morality) or comic (focused on human flaws as opposed to inherent inevitability) apocalyptic framing was seen in the past works on environment, such as Rachel Carson's Silent Spring (1962), Paul and Anne Ehrlich's The Population Bomb (1972), and Al Gore's Earth in the Balance (1992). [34] [35]

In the mid-2000s, James Lovelock gave predictions to the British newspapers The Independent and The Guardian , where he suggested that much of Europe will have turned to desert and "billions of us will die and the few breeding pairs of people that survive will be in the Arctic where the climate remains tolerable" by the end of the 21st century. [36] [37] In 2008, he was quoted in The Guardian as saying that 80% of humans will perish by 2100, and that the climate change responsible for that will last 100,000 years. [38] By 2012, he admitted that climate change had proceeded slower than he expected. [39]

2010s-present

In late 2010s, several articles have attracted attention for their predictions of apocalyptic impacts caused by climate change. Firstly, there was "The Uninhabitable Earth", [15] a July 2017 New York magazine article by David Wallace-Wells, which had become the most-read story in the history of the magazine, [40] and was later adapted into a book. Another was "What if we stopped pretending?", an article written for The New Yorker by Jonathan Franzen in September 2019. [16] Both articles were heavily criticized by the fact-checking organization Climate Feedback for the numerous inaccuracies about tipping points in the climate system and other aspects of climate change research. [17] [18]

Other examples of this genre include "What Comes After the Coming Climate Anarchy?", a year 2022 article for TIME magazine by Parag Khanna, which had asserted that hundreds of millions of people dying in the upcoming years and the global population standing at 6 billion by the year 2050 was a plausible worst-case scenario. [41] Further, some reports, such as "the 2050 scenario" from the Australian Breakthrough – National Centre for Climate Restoration [42] and the self-published Deep Adaptation paper by Jem Bendell [43] had attracted substantial media coverage by making allegations that the outcomes of climate change are underestimated by the conventional scientific process. [44] [45] [46] [47] [48] [49] Those reports did not go through the peer review process, and the scientific assessment of these works finds them of very low credibility. [5] [50]

Notably, subsequent writing by David Wallace-Wells had stepped back from the claims he made in either version of The Uninhabitable Earth. In 2022, he authored a feature article for The New York Times , which was titled "Beyond Catastrophe: A New Climate Reality Is Coming Into View". [51] The following year, Kyle Paoletta argued in Harper's Magazine that the shift in tone made by David Wallace-Wells was indicative of a larger trend in media coverage of climate change taking place. [52]

Scientific consensus and controversy

The IPCC Sixth Assessment Report projects that human population would be in a range between 8.5 billion and 11 billion people by 2050; the median population projection for the year 2100 is at 11 billion people, while the maximum population projection is close to 16 billion people. The lowest projection for 2100 is around 7 billion, and this decline from present levels is primarily attributed to "rapid development and investment in education", with those projections associated with some of the highest levels of economic growth. [7] In November 2021, Nature surveyed the authors of the first part of the IPCC assessment report: out of 92 respondents, 88% have agreed that the world is experiencing a "climate crisis", yet when asked if they experience "anxiety, grief or other distress because of concerns over climate change?" just 40% answered "Yes, infrequently", with a further 21% responding "Yes, frequently", and the remaining 39% answering "No". [53] Similarly, when a high-profile paper warning of "the challenges of avoiding a ghastly future" was published in Frontiers in Conservation Science, its authors have noted that "even if major catastrophes occur during this interval, they would unlikely affect the population trajectory until well into the 22nd Century", and "there is no way—ethically or otherwise (barring extreme and unprecedented increases in human mortality)—to avoid rising human numbers and the accompanying overconsumption." [54] [55]

Only a minority of publishing scientists have been more open to apocalyptic rhetoric. In 2009, Hans Joachim Schellnhuber, the Emeritus Director of the Potsdam Institute for Climate Impact Research, stated that if global warming reached 4 °C (7.2 °F) over the present levels, then the human population would likely be reduced to 1 billion. [8] In 2015, he complained that this remark was frequently misinterpreted as a call for active human population control rather than a prediction. [56] In a January 2019 interview for The Ecologist , he claimed that if we find reasons to give up on action, then there's a very big risk of things turning to an outright catastrophe, with the civilization ending and almost everything which had been built up over the past two thousand years destroyed. [9]

In May 2019, The Guardian interviewed several climate scientists about a world where 4 °C (7.2 °F) of warming over the preindustrial has occurred by 2100: one of them was Johan Rockström, who was reported to state "It’s difficult to see how we could accommodate a billion people or even half of that" in such a scenario. [10] Around the same time, similar claims were made by the Extinction Rebellion activist Roger Hallam, who said in a 2019 interview that climate change may "kill 6 billion people by 2100"—a remark which was soon questioned by the BBC News presenter Andrew Neil [57] and criticized as scientifically unfounded by Climate Feedback. [6] In November 2019, The Guardian article was corrected, acknowledging that Rockström was misquoted and his real remarks were "It’s difficult to see how we could accommodate eight billion people or maybe even half of that". [10]

In 2022, the United Nations published a report called Global Assessment Report on Disaster Risk Reduction’ (GAR2022) saying societal collapse due to crossing of planetary boundaries is very possible. The UN report call to preventive policies including incorporating planetary boundaries in the SDG targets. One of the authors said on condition of anonymity, that the report was strongly censored before being published, so that “The GAR2022 is an eviscerated skeleton of what was included in earlier drafts”. [58]

Climate endgame

In August 2022, Schellnhuber, Rockström and several other researchers, many of whom were associated with Centre for the Study of Existential Risk at the University of Cambridge, have published a paper in PNAS which argued that a lack of what they called "integrated catastrophe assessment" meant that the risk of societal collapse, or even eventual human extinction caused by climate change and its interrelated impacts such as famine (crop loss, drought), extreme weather (hurricanes, floods), war (caused by the scarce resources), systemic risk (relating to migration, famine, or conflict), and disease was "dangerously underexplored". [13] [12] The paper suggested that the following terms should be actively used in the future research.

Conceptual causal loop diagram of cascading global climate failure used in the "Climate endgame" paper. Cascading global climate failure.jpg
Conceptual causal loop diagram of cascading global climate failure used in the "Climate endgame" paper.
Defining key terms in the Climate Endgame agenda [12]
TermDefinition
Latent riskRisk that is dormant under one set of conditions but becomes active under another set of conditions.
Risk cascadeChains of risk occurring when an adverse impact triggers a set of linked risks.
Systemic riskThe potential for individual disruptions or failures to cascade into a system-wide failure.
Extreme climate changeMean global surface temperature rise of 3 °C (5.4 °F) or more above preindustrial levels by 2100.
Extinction riskThe probability of human extinction within a given timeframe.
Extinction threatA plausible and significant contributor to total extinction risk.
Societal fragilityThe potential for smaller damages to spiral into global catastrophic or extinction risk due to societal vulnerabilities, risk cascades, and maladaptive responses.
Societal collapseSignificant sociopolitical fragmentation and/or state failure along with the relatively rapid, enduring, and significant loss capital, and systems identity; this can lead to large-scale increases in mortality and morbidity.
Global catastrophic riskThe probability of a loss of 25% of the global population and the severe disruption of global critical systems (such as food) within a given timeframe (years or decades).
Global catastrophic threatA plausible and significant contributor to global catastrophic risk; the potential for climate change to be a global catastrophic threat can be referred to as "catastrophic climate change".
Global decimation riskThe probability of a loss of 10% (or more) of global population and the severe disruption of global critical systems (such as food) within a given timeframe (years or decades).
Global decimation threatA plausible and significant contributor to global decimation risk.
Endgame territoryLevels of global warming and societal fragility that are judged sufficiently probable to constitute climate change as an extinction threat.
Worst-case warmingThe highest empirically and theoretically plausible level of global warming.
Overlap between state fragility, extreme heat, and nuclear and biological catastrophic hazards.jpg
Overlap between state fragility, extreme heat, and nuclear and biological catastrophic hazards according to the "Endgame" paper [12]
Overlap between future population distribution and extreme heat.jpg
Overlap between future population distribution and extreme heat according to the same paper [12] This graphic was criticized for using a scenario considered unlikely and worse than the present trajectory. [14]

The paper was very high-profile, receiving extensive media coverage [13] [59] and over 180,000 page views by 2023. It was also the subject of several response papers from other scientists, all of which were also published at PNAS. Most have welcomed its proposals while disagreeing on some of the details of the suggested agenda. [60] [61] [62] [63] However, a response paper authored by Roger Pielke Jr. and fellow University of Colorado Boulder researchers Matthew Burgess and Justin Ritchie was far more critical. They have argued that one of the paper's main arguments—the supposed lack of research into higher levels of global warming—was baseless, as on the contrary, the scenarios of highest global warming called RCP 8.5 and SSP5-8.5 have accounted for around half of all mentions in the "impacts" section of the IPCC Sixth Assessment Report, and SSP3-7, the scenario of slightly lower warming used in some of the paper's graphics, had also assumed greater emissions and more extensive coal use than what had been projected by the International Energy Agency. They have also argued that just as the past projections of overpopulation were used to justify one-child policy in China, a disproportionate focus on apocalyptic scenarios may be used to justify despotism and fascist policies. [14] In response, the authors of the original paper wrote that in their view, catastrophic risks may occur even at lower levels of warming due to risks involving human responses and societal fragility. They also suggested that instead of the one-child policy, a better metaphor for responses to extreme risks research would be the 1980s exploration of the impacts of nuclear winter, which had spurred nuclear disarmament efforts. [64]

"Youth vs Apocalypse" banner seen at San Francisco Youth Climate Strike in 2019 San Francisco Youth Climate Strike - March 15, 2019 - 29.jpg
"Youth vs Apocalypse" banner seen at San Francisco Youth Climate Strike in 2019

Timescale

Bill McGuire (a professor of Geophysical and Climate Hazards and the author of "Hothouse Earth: An Inhabitant’s Guide") suggest that the collapse may occur by 2050. [65]

A study published in the Yale Journal of Industrial Ecology in the year of 2020, suggest that "current business-as-usual trajectory of global civilization is heading toward the terminal decline of economic growth within the coming decade—and at worst, could trigger societal collapse by around 2040". [66]

Public opinion

Some public polling shows that beliefs in civilizational collapse or even human extinction have become widespread amongst the general population in many countries. In 2021, a publication in The Lancet surveyed 10,000 people aged 16–25 years in ten countries (Australia, Brazil, Finland, France, India, Nigeria, Philippines, Portugal, the UK, and the US): one of its findings was 55% of respondents agreeing with the statement "humanity is doomed". [19]

In 2020, a survey by a French think tank Jean Jaurès Foundation found that in five developed countries (France, Germany, Italy, the UK and the US), a significant fraction of the population agreed with the statement that "civilization as we know it will collapse in the years to come"; the percentages ranged from 39% in Germany and 52% or 56% in the US and the UK to 65% in France and 71% in Italy. [20]

See also

Related Research Articles

<span class="mw-page-title-main">Holocene extinction</span> Ongoing extinction event caused by human activity

The Holocene extinction, or Anthropocene extinction, is the ongoing extinction event caused by humans during the Holocene epoch. These extinctions span numerous families of plants and animals, including mammals, birds, reptiles, amphibians, fish, and invertebrates, and affecting not just terrestrial species but also large sectors of marine life. With widespread degradation of biodiversity hotspots, such as coral reefs and rainforests, as well as other areas, the vast majority of these extinctions are thought to be undocumented, as the species are undiscovered at the time of their extinction, which goes unrecorded. The current rate of extinction of species is estimated at 100 to 1,000 times higher than natural background extinction rates and is increasing. During the past 100–200 years, biodiversity loss and species extinction have accelerated, to the point that most conservation biologists now believe that human activity has either produced a period of mass extinction, or is on the cusp of doing so. As such, after the "Big Five" mass extinctions, the Holocene extinction event has also been referred to as the sixth mass extinction or sixth extinction; given the recent recognition of the Capitanian mass extinction, the term seventh mass extinction has also been proposed for the Holocene extinction event.

<span class="mw-page-title-main">Human extinction</span> Hypothetical end of the human species

Human extinction is the hypothetical end of the human species, either by population decline due to extraneous natural causes, such as an asteroid impact or large-scale volcanism, or via anthropogenic destruction (self-extinction), for example by sub-replacement fertility.

<span class="mw-page-title-main">Human impact on the environment</span> Impact of human life on Earth and environment

Human impact on the environment refers to changes to biophysical environments and to ecosystems, biodiversity, and natural resources caused directly or indirectly by humans. Modifying the environment to fit the needs of society is causing severe effects including global warming, environmental degradation, mass extinction and biodiversity loss, ecological crisis, and ecological collapse. Some human activities that cause damage to the environment on a global scale include population growth, neoliberal economic policies and rapid economic growth, overconsumption, overexploitation, pollution, and deforestation. Some of the problems, including global warming and biodiversity loss, have been proposed as representing catastrophic risks to the survival of the human species.

<span class="mw-page-title-main">Effects of climate change</span>

Effects of climate change are well documented and growing for Earth's natural environment and human societies. Changes to the climate system include an overall warming trend, changes to precipitation patterns, and more extreme weather. As the climate changes it impacts the natural environment with effects such as more intense forest fires, thawing permafrost, and desertification. These changes impact ecosystems and societies, and can become irreversible once tipping points are crossed. Climate activists are engaged in a range of activities around the world that seek to ameliorate these issues or prevent them from happening.

<span class="mw-page-title-main">Abrupt climate change</span> Form of climate change

An abrupt climate change occurs when the climate system is forced to transition at a rate that is determined by the climate system energy-balance. The transition rate is more rapid than the rate of change of the external forcing, though it may include sudden forcing events such as meteorite impacts. Abrupt climate change therefore is a variation beyond the variability of a climate. Past events include the end of the Carboniferous Rainforest Collapse, Younger Dryas, Dansgaard–Oeschger events, Heinrich events and possibly also the Paleocene–Eocene Thermal Maximum. The term is also used within the context of climate change to describe sudden climate change that is detectable over the time-scale of a human lifetime. Such a sudden climate change can be the result of feedback loops within the climate system or tipping points in the climate system.

<span class="mw-page-title-main">Societal collapse</span> Fall of a complex human society

Societal collapse is the fall of a complex human society characterized by the loss of cultural identity and of social complexity as an adaptive system, the downfall of government, and the rise of violence. Possible causes of a societal collapse include natural catastrophe, war, pestilence, famine, economic collapse, population decline or overshoot, mass migration, incompetent leaders, and sabotage by rival civilizations. A collapsed society may revert to a more primitive state, be absorbed into a stronger society, or completely disappear.

Human overpopulation is the idea that human populations may become too large to be sustained by their environment or resources in the long term. The topic is usually discussed in the context of world population, though it may concern individual nations, regions, and cities.

<span class="mw-page-title-main">Extinction risk from climate change</span> Risk of plant or animal species becoming extinct due to climate change

There are several plausible pathways that could lead to an increased extinction risk from climate change. Every plant and animal species has evolved to exist within a certain ecological niche. But climate change leads to changes of temperature and average weather patterns. These changes can push climatic conditions outside of the species' niche, and ultimately render it extinct. Normally, species faced with changing conditions can either adapt in place through microevolution or move to another habitat with suitable conditions. However, the speed of recent climate change is very fast. Due to this rapid change, for example Ectotherm cold-blooded animals may struggle to find a suitable habitat within 50 km of their current location at the end of this century.

<span class="mw-page-title-main">Climate change in the Arctic</span> Impacts of climate change on the Arctic

Due to climate change in the Arctic, this polar region is expected to become "profoundly different" by 2050. The speed of change is "among the highest in the world", with the rate of warming being 3-4 times faster than the global average. This warming has already resulted in the profound Arctic sea ice decline, the accelerating melting of the Greenland ice sheet and the thawing of the permafrost landscape. These ongoing transformations are expected to be irreversible for centuries or even millennia.

<span class="mw-page-title-main">Tipping points in the climate system</span> Concept in climate science on critical thresholds

In climate science, a tipping point is a critical threshold that, when crossed, leads to large, accelerating and often irreversible changes in the climate system. If tipping points are crossed, they are likely to have severe impacts on human society and may accelerate global warming. Tipping behavior is found across the climate system, for example in ice sheets, mountain glaciers, circulation patterns in the ocean, in ecosystems, and the atmosphere. Examples of tipping points include thawing permafrost, which will release methane, a powerful greenhouse gas, or melting ice sheets and glaciers reducing Earth's albedo, which would warm the planet faster. Thawing permafrost is a threat multiplier because it holds roughly twice as much carbon as the amount currently circulating in the atmosphere.

<span class="mw-page-title-main">Effects of climate change on plant biodiversity</span>

There is an ongoing decline in plant biodiversity, just like there is ongoing biodiversity loss for many other life forms. One of the causes for this decline is climate change. Environmental conditions play a key role in defining the function and geographic distributions of plants. Therefore, when environmental conditions change, this can result in changes to biodiversity. The effects of climate change on plant biodiversity can be predicted by using various models, for example bioclimatic models.

<span class="mw-page-title-main">Sea level rise</span> Rise in sea levels due to climate change

Between 1901 and 2018, the average sea level rose by 15–25 cm (6–10 in), with an increase of 2.3 mm (0.091 in) per year since the 1970s. This was faster than the sea level had ever risen over at least the past 3,000 years. The rate accelerated to 4.62 mm (0.182 in)/yr for the decade 2013–2022. Climate change due to human activities is the main cause. Between 1993 and 2018, melting ice sheets and glaciers accounted for 44% of sea level rise, with another 42% resulting from thermal expansion of water.

<span class="mw-page-title-main">Global catastrophic risk</span> Hypothetical global-scale disaster risk

A global catastrophic risk or a doomsday scenario is a hypothetical event that could damage human well-being on a global scale, even endangering or destroying modern civilization. An event that could cause human extinction or permanently and drastically curtail humanity's existence or potential is known as an "existential risk".

<span class="mw-page-title-main">Permafrost carbon cycle</span> Sub-cycle of the larger global carbon cycle

The permafrost carbon cycle or Arctic carbon cycle is a sub-cycle of the larger global carbon cycle. Permafrost is defined as subsurface material that remains below 0o C for at least two consecutive years. Because permafrost soils remain frozen for long periods of time, they store large amounts of carbon and other nutrients within their frozen framework during that time. Permafrost represents a large carbon reservoir, one which was often neglected in the initial research determining global terrestrial carbon reservoirs. Since the start of the 2000s, however, far more attention has been paid to the subject, with an enormous growth both in general attention and in the scientific research output.

<span class="mw-page-title-main">Biodiversity loss</span> Extinction of species or loss of species in a given habitat

Biodiversity loss happens when plant or animal species disappear completely from Earth (extinction) or when there is a decrease or disappearance of species in a specific area. Biodiversity loss means that there is a reduction in biological diversity in a given area. The decrease can be temporary or permanent. It is temporary if the damage that led to the loss is reversible in time, for example through ecological restoration. If this is not possible, then the decrease is permanent. The cause of most of the biodiversity loss is, generally speaking, human activities that push the planetary boundaries too far. These activities include habitat destruction and land use intensification. Further problem areas are air and water pollution, over-exploitation, invasive species and climate change.

<span class="mw-page-title-main">Climate apocalypse</span> Term to describe possible catastrophic events due to climate change

A climate apocalypse is a term used to denote a predicted scenario involving the global collapse of human civilization due to climate change. Such collapse could theoretically arrive through a set of interrelated concurrent factors such as famine, extreme weather, war and conflict, and disease. There are many similar terms in use such as climate dystopia, collapse, endgame, and catastrophe.

The term collapsology is a neologism used to designate the transdisciplinary study of the risks of collapse of industrial civilization. It is concerned with the general collapse of societies induced by climate change, as well as "scarcity of resources, vast extinctions, and natural disasters." Although the concept of civilizational or societal collapse had already existed for many years, collapsology focuses its attention on contemporary, industrial, and globalized societies.

<span class="mw-page-title-main">Global catastrophe scenarios</span> Scenarios in which a global catastrophe creates harm

Scenarios in which a global catastrophic risk creates harm have been widely discussed. Some sources of catastrophic risk are anthropogenic, such as global warming, environmental degradation, and nuclear war. Others are non-anthropogenic or natural, such as meteor impacts or supervolcanoes. The impact of these scenarios can vary widely, depending on the cause and the severity of the event, ranging from temporary economic disruption to human extinction. Many societal collapses have already happened throughout human history.

This is an article of notable issues relating to the terrestrial environment of Earth in 2022. They relate to environmental events such as natural disasters, environmental sciences such as ecology and geoscience with a known relevance to contemporary influence of humanity on Earth, environmental law, conservation, environmentalism with major worldwide impact and environmental issues.

The decline of wild mammal populations globally has been an occurrence spanning over the past 50,000 years, at the same time as the populations of humans and livestock have increased. Nowadays, the total biomass of wild mammals on land is believed to be seven times lower than its prehistoric values, while the biomass of marine mammals had declined fivefold. At the same time, the biomass of humans is "an order of magnitude higher than that of all wild mammals", and the biomass of livestock mammals like pigs and cattle is even larger than that. Even as wild mammals had declined, the growth in the numbers of humans and livestock had increased total mammal biomass fourfold. Only 4% of that increased number are wild mammals, while livestock and humans amount to 60% and 36%. Alongside the simultaneous halving of plant biomass, these striking declines are considered part of the prehistoric phase of the Holocene extinction.

References

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