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A climate apocalypse (also called a climate dystopia and a climate-induced collapse, among other names) is a hypothetical scenario involving the global collapse of human civilization and potential human extinction as either a direct or indirect result of anthropogenic climate change and ecological breakdown. Under a global catastrophe of this scale, some or all of the Earth may be rendered uninhabitable as a result of extreme temperatures, severe weather events, an inability to grow crops, and an altered composition of the Earth's atmosphere.

There is scientific consensus on climate change and consensus on the attribution of recent climate change to human activity. There is also consensus that climate change is non-linear and that rate of warming is influenced by tipping points and feedback loops. There is no consensus at what exact point these may be triggered, but it is established that the level of risk increases with the rise in temperature. There is also no consensus that humanity must take dramatic steps to curtail fossil fuel consumption to avoid the collapse of civilization.

Etymology and usage
The English word "apocalypse", derived from the Greek term "apokalupsis" meaning "revelation", refers to a great catastrophe that results in widespread destruction or the collapse of civilisation.

There is no single agreed term used to describe an environmental and ecological collapse as either a direct or indirect result of anthropogenic climate change, however such an event has been explored in both fiction and non-fiction for many years. Jules Verne's 1889 novel The Purchase of the North Pole imagines climate change due to a deliberate tilting of Earth's axis.

Since World War II, there has been continual discussion of environmental destruction due to nuclear war.

In 1962, Rachel Carson's seminal book Silent Spring documented the environmental damage caused by indiscriminate use of pesticides, one of the major causes of declining bee and pollinator populations. In her opening chapter, "A Fable for Tomorrow" Carson uses apocalyptic language to describe an American town with devastated plant and wildlife as a result of human activity.

There is a Western world tradition of describing a climate apocalypse with images and descriptions of the Four Horsemen of the Apocalypse and other features of the apocalypse of the Christian faith.

In July 2018, Professor Jem Bendell published the paper entitled Deep Adaptation: A Map for Navigating Climate Tragedy. Within it, Bendell refers to the collapse of civilization due to climate change using longer terms such as "climate-induced societal collapse." In his paper, he refers explicitly to the lack of discussion around this topic in research publications, which may be one of the reasons that no standardized term exists yet to describe the scenario.

Atmosphere
Between 4-6°C above pre-industrial levels, warming oceans may result in a large amount of methane from underwater stores being released into the atmosphere. Methane is flammable and may be ignited by small sparks or lightning storms. Scientists theorise that such an explosion would have much greater impact than a nuclear bomb, and could wipe out life on Earth almost entirely. Hydrogen sulphide levels increase in stagnant oceans and are very dangerous for marine life, and the gas is poisonous for both plants and animals if released into the atmosphere. Sulphur dioxide produced in this scenario would also damage the ozone layer, exposing life on Earth to fatal levels of UV radiation.

Disease
Rising temperatures increase the risk of an epidemic or pandemic. As the climate changes, distributors of infectious diseases such as mosquitoes and ticks spread to new areas and transmit illnesses to regions which may not have experienced them otherwise. Epidemics are also made more likely after severe weather events, such as heavy rainfall or flooding. Food scarcity may lead some communities to a more meat-based diet, which raises the risk of outbreaks of diseases such as Ebola. Melting permafrost also threatens to release diseases that have been dormant for many years, as was the case in August 2016, when a thawed reindeer carcass that was almost a century old infected several individuals with anthrax.

Food scarcity
Many plants have a maximum temperature at which they can grow, and climate change may mean that new pests are introduced to areas where it was too cold for them to survive before. Extreme weather events and more frequent droughts will also affect crop production as the Earth approaches and surpasses 2°C above pre-industrial levels. A global decline in food availability could lead to severe impacts on public health. If the Earth's temperature increases to 2°C above pre-industrial levels by 2050, some models predict that global food availability would be 3.2 percent lower than if no climate change occurred, resulting in an additional 529,000 deaths worldwide.

Heat deaths
A 2017 review considered research over past decades and predicted that by 2100, 74% of the regions where people now live would become environments of lethal heat illness for routine human life.

Mass displacement
As regions become too hot to inhabit or grow crops, as water becomes more scarce, as sea levels rise and as extreme weather events grow more frequent and more severe, it is likely that more people will be displaced from their homes, which could result in social instability and conflict when these people move to new areas.

According to the 2019 Global Report on Internal Displacement by the Internal Displacement Monitoring Centre, 61% of all new internal displacement in 2018 was caused by natural disasters, totalling 17.2 million people. Some predict that as the number of migrants from poorer nations increases, wealthier nations will impose higher restrictions on immigration and governments will become increasingly authoritarian and populist. Some areas, such as Europe, are more vulnerable to the stresses of increased migration as a result of their geographical location as well as diplomatic relations with bordering nations.

Mass extinction
The Earth is currently undergoing its sixth mass extinction event as a result of human activity. During the Permian–Triassic extinction event 250 million years ago, the Earth was approximately 6°C higher than the pre-industrial baseline. At this time, 95% of living species were wiped out and sea life suffocated due to a lack of oxygen in the ocean. During the previous mass extinction around 66 million years ago, an asteroid or comet is predicted to have collided with the Earth, drastically altering the planet's climate and wiping out the dinosaurs as well as around 75% of all plant and animal species on the planet.

Natural disasters
Climate change increases the frequency and intensity of extreme weather events including droughts, storms and flooding. Although it is not possible to determine whether or not a specific natural disaster occurred because of climate change, it is possible to state how much more likely a natural disaster was as a result of climate change.

Sea-level rise
As temperatures increase, glaciers and ice sheets melt and the ocean expands which causes a rise in sea levels. Sea levels have risen by about 23 cm since 1880 and are currently rising at around 3.2 mm each year. It is difficult to predict amounts of sea-level rise over the next century, although the ice sheets are melting earlier than predicted which makes a high-end scenario of 2 metres of sea-level rise by 2100 increasingly plausible. If the entire Greenland ice sheet were to melt, the world's oceans could rise by more than 6 metres. In the past, at times when the Earth has been 6°C above the pre-industrial baseline, sea levels were 20 metres higher than today. If all the ice on land and at the poles melted, sea levels would rise by more than 65 metres. Rising sea levels result in forced migration and threaten services like the Internet, since a lot of the Internet's key infrastructure is built near coastlines and is not built to be permanently submerged in water.

Societal collapse
Research has shown that aside from worsening income inequality and the strain of an increased population exceeding the carrying capacity of an environment, another important factor which may lead to global collapse is ecological strain. Climate change increases the strain on the planet's ecology, especially in terms of resource depletion.

Climate change has contributed to the collapse of civilisations in the past. A 200-year drought caused cities of the Indus Valley Civilisation to be abandoned; the Khmer Empire collapsed as a result of successive droughts and monsoon floods which led to political and social unrest; and a period of cooling called the Little Ice Age made it more difficult for Vikings to farm in Greenland, which was one of the reasons that they were forced to abandon their settlements.

More recently, a severe drought in the late 2000's which is likely to have been intensified by anthropogenic climate change contributed to failing agricultural production in Syria, leading to high unemployment, large amounts of internal displacement, heightened ethnic tensions and increased violence. Poor governance and neoliberal economic policies also contributed to the resulting civil war and societal collapse in 2011.

Although the entire planet is affected by climate change, the worst impacts will be felt by the world's poorest countries, and these countries are both more likely to face the effects of societal collapse and more likely to face such effects sooner. This is one of the moral issues described within the climate justice movement of climate change activism.

As societal collapse becomes more likely, it is possible that denial and anti-intellectualism will increase as well, or that people will assign blame for the crisis on communities other than their own. As localised violence increases, societal collapse also becomes more likely.

Water scarcity
Around 2% of the planet's water is fresh and approximately 70% of that is snow and ice, which turns into salt water as the Earth's temperatures increase, meaning that as glaciers melt many communities that rely on these sources for water will lose their supply. Climate change can also lead to heavier rainfall in some areas, leading to rapid movement of water to the oceans and reducing the capacity of people to use and store it. In other areas rainfall is reduced, and overall the world experiences more extreme floods and droughts as a result of climate change. Warmer air also results in higher rainfall and less snowfall and an increase in evaporation rates. Different regions will be affected to different degrees, but the IPCC predicts that around one billion people in dry areas of the world may face increasing water scarcity.

Research shortcomings
Large-scale changes to the Earth system such as tipping points and possible abrupt climate change are usually not included in climate models and impact assessments. This means that many scientific reports, including the IPCC Assessment Reports, have often underestimated the impacts of climate change effects.

Climate scientists may also downplay potentially disastrous scenarios in favor of more restrained predictions that are less likely to be rejected as alarmist or fatalist. Discussions of 'tail-end' risks of temperatures rising beyond 3°C are also often neglected in research more generally.

Rate of warming
Current levels of global warming are often calculated in terms of the global average increase in the Earth's temperature compared with levels prior to the Industrial Revolution. In 2016, the Earth is likely to have reached 1.1°C above pre-industrial levels. The rate of global warming is influenced by the amount of greenhouse gases released into the atmosphere, which has so far led to a linear increase in global warming. However global warming is non-linear, and is subject to acceleration when certain tipping points are crossed in the Earth's climate system. These may also lead to abrupt climate change.

Tipping points
It is more likely that the Earth will cross tipping points and/or trigger abrupt climate change as it approaches and surpasses 2°C above pre-industrial levels. Some of these tipping points may lead to accelerated global warming. In the event that warming is limited to 2°C by 2100, these carbon cycle feedbacks could still cause an additional 0.24-0.66°C of warming by that year. These tipping points could be triggered much earlier, and could continue to warm the planet for hundreds or even thousands of years.

Abrupt climate change
Methane hydrate stores beneath the ocean could be released very suddenly as a result of increasing sea temperatures. Methane is a greenhouse gas which is 20 times more powerful than carbon dioxide and would result in further warming if released. Methane may have been released as a result of warming oceans during the Permian–Triassic extinction event.

Hothouse Earth
A paper published in the journal PNAS in August 2018 entitled "Trajectories of the Earth System in the Anthropocene" described a threshold which, if crossed, could trigger multiple tipping points and self-reinforcing feedback loops that would prevent stabilization of the climate, causing much greater warming and sea-level rises and leading to severe disruption to ecosystems, society, and economies. It described this as the "Hothouse Earth" scenario and proposed a threshold of around 2°C above pre-industrial levels, arguing that decisions taken over the next decade could influence the climate of the planet for tens to hundreds of thousands of years and potentially even lead to conditions which are inhospitable to current human societies. The report also states that there is a possibility of a cascade of tipping points being triggered even if the goal outlined in the Paris Agreement to limit warming to 1.5-2.0°C is achieved.

Point of collapse
Even in mid-range scenarios of around 3°C above pre-industrial levels, extreme weather events, large-scale loss of agricultural land and freshwater sources, and collapsing ecosystems could lead to widespread suffering and instability and over a billion people who currently live in major coastal cities would need to be relocated due to sea-level rise. One report published by the Global Challenges Foundation wrote that the potential destruction of high-end scenarios are beyond their capacity to model, but that there is a high likelihood of human civilization coming to an end. The article states that we are currently in a position where we can reduce the risk of civilization collapse due to climate change, and possibly avoid it.

Although runaway climate change may be triggered at 2°C or even lower, societal collapse in different regions may not happen until later, although there is no consensus as to when this may happen. Some scientists and institutions such as the World Bank have argued that it is uncertain whether adaptation to a 4°C world is possible, and that such an increase in temperature is incompatible with an organised global community.

Attempt to lessen apocalypse
Grist advised that although there is an expectation of a horrible Climate Apocalypse, it could be less horrible or more horrible depending when there is a coordinated response to lessen the damage.

KQED reported that the scientific consensus is to take whatever action possible, wherever possible, even when there are reports of a coming Climate Apocalypse.

Scientists commenting in The Atlantic said that the Representative Concentration Pathway was an important measurement to watch, and that as of 2018 this measurement predicts a worst case scenario for the world.

Stratospheric aerosol injection, a hypothetical process for blocking sunlight from the earth, is proposed as a desperate technological response to reduce existential risk.

What if we stopped pretending?
An article written for The New Yorker by Jonathan Franzen in September 2019 argued that those under the age of sixty at time of publishing the article were likely to see the radical destabilization of life on earth due to crop failures, fires, crashing economies, flooding, and hundreds of millions of climate refugees, while those under the age of thirty were almost certain to see it. The article attracted huge controversy for arguing that humanity must now accept that a climate apocalypse is inevitable, and was heavily criticized for being defeatist, as well as for drawing false scientific conclusions that such a scenario was inevitable, rather than possible.

The Age of Consequences
A report published in November 2007 by various authors including former director of the CIA R. James Woolsey Jr., former national security advisor to Al Gore Leon Fuerth, and former chief of staff for President Bill Clinton John Podesta entitled "The Age of Consequences: The Foreign Policy and National Security Implications of Global Climate Change" describes both a "severe" and a "catastrophic" scenario in which global warming reaches 1.6°C above pre-industrial levels by 2040 and 5.6°C by 2100 respectively.

In the "severe" scenario, nonlinear climate change has devastating impacts on society including a possible pandemic; societal instability due to large increases in migration and food and water shortages; threatened identities of global communities as a result of rising sea levels and coastal flooding; likely conflict over resources and possible nuclear war. The authors write that in this scenario climate change causes humanity to undergo a permanent shift in its relationship to nature.

In the "catastrophic" scenario, the authors write that human society would struggle to adapt, and note that this scenario is so extreme that its impacts are difficult to imagine. The authors encourage readers to compare the scenario to the threat of terrorism, emphasising that the solution to both threats relies on a transformation of the world's energy economy.

"The 2050 scenario"
In May 2019, Breakthrough - National Centre for Climate Restoration released a report which argued that climate change represents an existential threat to human civilisation in the near to mid-term, calling for a wartime level of response to combat it. The report featured heavily in the media due to the gravity of its message.

The report described a "2050 scenario" which the authors define as a way of thinking at the high-end of the range of possibilities rather than a scientific projection. Within this scenario, policy-makers fail to act sufficiently and global emissions do not peak until 2030. Climate feedbacks are triggered which lead to global warming of 1.6°C above pre-industrial levels by 2030, and 3°C by 2050, leading the Earth into the "hothouse Earth" scenario. Sea levels increase by 2-3 metres by 2100, with an eventual 25 metres of sea-level rise locked in. Some regions become unlivable due to the intense heat and lack of adaptive capacity and around a billion people are displaced, while two billion people suffer from water shortages. There is not enough food to feed the global population and many of the world's most populous cities are abandoned due to sea level rise.

Famous figures
In an interview for The Ecologist, the Emeritus Director of the Potsdam Institute for Climate Impact Research Prof. Hans Joachim Schellnhuber warned that if we continue as we are now, then over the next century we may bring civilization to an end. He predicted that humans would survive somehow, but that almost everything which had been built up over the past two thousand years would be destroyed. He rated chances of success in the fight against climate change as more than 5% but definitely less than 50%.

In his 2019 BBC documentary Climate Change – The Facts, Sir David Attenborough warns that dramatic action needed to be taken against climate change within the next decade to avoid irreversible damage to the natural world and the collapse of human societies. In a 2019 Channel 4 interview with Jon Snow, Attenborough states that the worst outcome of climate change that could be experienced within the next seventy years would be civil unrest and mass migration on a great scale. He predicts that humans will continue to find enough food, but that their diets will be forced to change.

Professor Emeritus of climate strategy at the BI Norwegian Business School Jørgen Randers predicts that we will fail to meet the pledges of the Paris Agreement as in the short-term it is cheaper to continue acting as usual.

As a lifelong environmentalist, Prince Charles has given speeches warning that climate change could bring unimaginable horrors and that it calls into question our future survival on the planet.

Pope Francis has stated that climate change threatens the future of the human family and that we must take action to protect future generations and the world's poorest who will suffer the most from humanity's actions. He has also stated that our choice of energy has the potential to destroy our civilization and that this must be avoided.

In an interview, the Secretary-General of the United Nations António Guterres warned that the world was losing the fight against climate change, and described lack of action on climate change as "suicide".

Adapting to a collapse
According to Professor Jem Bendell, Deep Adaptation is the concept purporting that humanity needs to prepare for fundamental disruption of its current civilisation paradigms, due to climate change, with a likelihood of complete societal collapse. Unlike climate change adaptation, which aims to adapt societies gradually to the effects of climate change, Deep Adaptation is premised on accepting abrupt transformation of the environment as a consideration for making decisions today.

In 2019, Jem Bendell started the Deep Adaptation Forum. According to the website, the Deep Adaptation Forum is an "international online space to connect people, in all spheres of life, to foster mutual support; collaboration; and professional development in the process of facing societal collapse." Bendell also created a Deep Adaptation Facebook group for discussing these topics.

Social critique of literature
Various academic publications describe how political discourse, the media, and scientific studies address the idea of a rapidly approaching Climate Apocalypse.

People in various cultures at various times have told stores about climate change. Among all cultures and times which tell these stories, patterns in the stories which repeat include questioning whether humans caused the change, the relationship between short-term local experiences and longer term global records, people of common cultures producing images of climate change which align with others in their culture but not with those outside their culture, designating certain classes of institutions like laboratories as being reliable sources of information, and the modification of reliable reports to create a more desirable narrative of how the information ought to lead to a particular community changing their behavior. Discussion of climate change is unusual for having attracted unusually diverse participation of communities which strongly present their own view. Those communities include citizens engaged in public participation, academic sectors, any non-academic professional sector asserting knowledge, participants in popular culture, advocates for Indigenous peoples, anyone negotiating the powers of capitalism, those practicing a religion, and anyone responding to public opinion. Sources of information about climate change tell various categories of stories, including personal experiences, community experiences, scientific models, economic forecasts, and prophecies of apocalypse.

Some researchers have speculated that society cannot comprehend an accurate end of the world prediction, and instead, more governments would be willing to respond productively to prevent catastrophe if the to reports which framed the matter as a smaller problem than it actually is. Somehow talking about Doomsday can have a broad effect in society of making many people feel that if the situation is truly horrible, then there must be good plans to prevent it so no further action is needed.

As the Climate Apocalypse comes closer, the media presents many imagined apocalypse scenarios in a way that conflates them all.

Contemporary narratives
Political conversations about the Climate Apocalypse tend to describe how preventing it in the future would bring zero value for today, therefore the value of doing something today is zero. The lack of response in the context of the evidence of coming doom may be an indication that human society lacks an ability to understand a threat of this magnitude without some radical change in perspective.

Esquire described how since 1990 climate scientists have communicated urgent warnings while simultaneously experiencing the media converting their statements into sensational entertainment.

A 2013 report described how incorporating the concept of preventing catastrophe into public policy seems unprecedented and challenging to accomplish.

In popular culture
Climate fiction is a popular media genre which frequently features stories of the Climate Apocalypse. Examples include Ismael, a 1992 philosophical novel, and Mad Max: Fury Road, a 2015 action film.

Concern over the climate Apocalypse has been the subject of articles of satirical news features. One theme is popular revolt against power brokers. Another is the desire of youth to have a livable environment in adulthood. Another are fantasies about the romance and adventure of people experiencing the chaos of ecological and societal collapse.