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The most severe potential impacts of the global heating for the UK have been detailed by experts, including a searing 4C rise in mean temperatures to a 6.5-foot surge in sea level. An alternative projection foresees a decline of 6C in temperatures following the collapse of critical Atlantic Ocean currents, which would severely impact food production and energy needs.

Possible Events, Not Guarantees

These consequences, some of which are associated with climate tipping points, are considered as low probability but plausible. The scientists explained that these models addressed a shortfall in planning that had rendered the UK unprepared for extreme outcomes.

"The severe weather events we have outlined should not be seen as certainties, but they are plausible," said the professor who directed the research. "The UK has been planning in the absence of the methods to test against worst-case scenarios. We've now supplied policymakers what they need to prepare for environmental results they wish to avoid, but can’t afford to ignore."

A Spectrum of Severe Conditions Scenarios

A further series of severe models maps the possible scale of extreme weather between now and the close of the 2100s. These show that thermometer readings could rocket in certain periods by up to 6C above average, while precipitation could be 300% of normal levels.

The chance of the worst-case outcomes occurring could not be calculated due to uncertainty about what steps will be taken to tackle global heating and how the climate system will respond. This approach was described as similar to national security risk assessments or resilience checks for economic stability.

Major Scenario Elements

• Four-Degree Warming: Worldwide averages exceeding 4C by 2100 could occur if climate action breaks down or if vicious cycles like the Amazon rainforest becoming a net carbon source emit its enormous store of carbon. This would result in severe and lengthy heat domes and droughts hitting the UK in summer.
• AMOC Shutdown: A critical sea current, the Atlantic meridional overturning circulation (Amoc), is losing strength and showing signs of collapse due to climate change. A full shutdown beginning in 2030 would lead to a drastic cooling in the UK. "Farming would struggle enormously and water supplies would be drastically changed," explained the lead researcher.
• Rapid Sea Level Rise: A rise of 2.0-2.2 metres around the UK by 2100 could take place if glaciers in Greenland and Antarctica collapse rapidly, inundating coastal cities and towns. Unlike the other scenarios, this threat is already known by planners.
• Aerosol Effect: Global averages could also be increased by about 0.75C if airborne particulates is rapidly cleaned up. This unexpected result occurs because tiny specks from industrial activity scatter solar radiation from warming the ground.

Building Resilience Against the Extreme

The worst-case scenarios could be utilized in planning the building of long-term infrastructure, including new towns, power generation facilities and flood defences. Awareness of these future hazards could also speed the transition to slash greenhouse gas emissions.

The research formulated the worst-case scenarios using a combination of past data and records, computer simulations and climate physics. These outcomes exclude potential global problems including the global food shortages and geopolitical instability.

The project was requested as part of a national risk assessment framework. Earlier reports have cautioned that not enough attention was being allocated to catastrophic yet improbable risks.

The government's climate advisors has stated that the UK needs to "adapt to 2C" and assess the risks for severe warming. Earlier government strategies have been described as being "very weak" by environmental groups.

An official statement commented: "Global warming is at the core of the country's focus, both building resilience and transitioning to a low-carbon economy. It is crucial that the UK is ready for the consequences."