Earths atmosphere no relation global catastrophic risk
A climate apocalypse (also called a climate dystopia and a climate-induced collapse, among other names) generally denotes a predicted scenario involving the global collapse of human civilization and potential human extinction as either a direct or indirect result of anthropogenic climate change. Many academics and researchers  posit that in actuality, unless a major course correction is imminently implemented, some or all of the Earth will 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.Many scientists have repeatedly warned about severe risks up to the level of what may described as "climate apocalypse". For example, in September 2021 more than 200 scholarly medical journals published an emergency call for action, saying that a temperature increase of 1.5 degrees would bring catastrophic harm to global health from which the world will never recover.Climate apocalypse scenarios are explored in multiple science fiction works, in particular in climate fiction including The Parable of the Sower by Octavia Butler, which depicts ecological breakdown through societal collapse; American War by Omar El Akkad, which explores the idea of an underwater, war-stricken country; or The Word for World is Forest by Ursula Le Guin that engages in space colonization to escape the conditions of Earth.
In academia, fields that investigate such risks include systems theory and climate security where the latter refers to research and development relating to national and international security risks induced, directly or indirectly, by changes in climate patterns. Sometimes, worst-case scenarios are used to highlight the importance of improved efforts in climate change mitigation or in calls for declarations of climate emergency in order to enable such.Apocalyptic impacts of climate change and ecological breakdown
Severe impacts of climate change can combine, including with climate-unrelated, concurrent risks such as worldwide pollution, fragility, resource depletion, political disenchantment, poverty or wealth inequality, and biotechnology risk, to result in a confluence of developments that cause a drastically aggravated impact on societies or humanity – such multiple concurrent crises are sometimes referred to as a "perfect storm". Climate change may also be considered as a threat multiplier "which exacerbates existing trends, tensions, and instability". Climate-related factors of a potential collapse may include famine (crop loss, drought), extreme weather (hurricanes, floods), war ([co-]caused by scarce resources) and conflict, systemic risk (relating to migration, famine, or conflict), and disease."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.
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