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The gravest possible consequences of the climate crisis for the UK have been outlined by scientists, ranging from a scorching 4C jump in mean temperatures to a 6.5-foot rise in sea levels. A separate possibility predicts a plunge of 6C in temperature following the failure of crucial Atlantic Ocean currents, which would severely impact farming and energy demand.

Credible Outcomes, Not Guarantees

These effects, some of which are connected to climate tipping points, are seen as low probability but possible. The scientists explained that these projections plugged a hole in risk assessment that had rendered the UK not ready for extreme outcomes.

"The climate extremes we have detailed should not be seen as certainties, but they are possible," commented the professor who led the research. "The nation has been formulating policy lacking the tools to assess catastrophic outcomes. We've now given planners what they need to prepare for environmental results they wish to avoid, but can’t afford to ignore."

A Range of Harsh Climate Possibilities

Another collection of severe models sets out the projected severity of extreme weather between now and the close of the 2100s. These suggest that temperatures could skyrocket in particular seasons by up to 6C higher than the norm, while rainfall could be 300% of typical amounts.

The chance of the catastrophic events occurring could not be calculated due to a lack of certainty about what measures will be enacted to address global heating and how the Earth's systems will react. This analysis was compared to national security risk assessments or stress tests for the banking sector.

Major Possibility Details

• Severe Heating: Worldwide averages soaring past 4C by 2100 could happen if emissions cuts breaks down or if vicious cycles including the Amazon basin perishing unleash its enormous store of carbon. This would result in extreme and prolonged heat domes and droughts plaguing the UK in summer.
• AMOC Shutdown: A major ocean current, the Atlantic meridional overturning circulation (Amoc), is losing strength and losing stability due to ocean warming. A collapse beginning in 2030 would lead to a 6C cooling in the UK. "Crop production would struggle enormously and water resources would be completely altered," explained the professor.
• Accelerated Coastal Flooding: A rise of 2.0-2.2 metres around the UK by 2100 could occur if ice sheets in the Arctic and Antarctic disintegrate quickly, submerging low-lying areas. Unlike the other scenarios, this possibility is already recognized by planners.
• Aerosol Effect: Temperatures could also be driven up by about 0.75C if industrial aerosols is rapidly cleaned up. This counterintuitive effect occurs because tiny specks from industrial activity block sunlight from warming the ground.

Building Resilience Against the Unthinkable

The severe models could be used to inform the building of long-term infrastructure, including expanded cities, energy plants and flood defences. Knowledge about these future hazards could also accelerate the transition to cut carbon pollution.

The research created the worst-case scenarios using a mix of real-world events, digital projections and established principles. These outcomes omit potential global problems like the agricultural collapse and resource wars.

The project was requested as part of a official risk assessment framework. Earlier reports have cautioned that not enough attention was being allocated to high-consequence, low-probability risks.

Official experts has recommended that the UK needs to "prepare for two degrees of warming" and evaluate the threats for 4C. Past policy documents have been described as being "inadequate" by environmental groups.

An official statement noted: "Global warming is at the center of the country's focus, both preparing for impacts and becoming a clean energy superpower. It is vital that the UK is resilient for the effects."