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The direst potential impacts of the climate crisis for the UK have been detailed by experts, including a scorching 4C rise in temperatures to a two-metre rise in sea level. Another scenario envisions a decline of 6C in temperatures following the shutdown of key Atlantic Ocean currents, which would massively disrupt food production and power requirements.

Possible Events, Not Guarantees

These consequences, certain ones are associated with irreversible climate shifts, are seen as low probability but possible. The researchers stated that these models filled a gap in risk assessment that had rendered the UK not ready for extreme outcomes.

"The climate extremes we have mapped should not be seen as certainties, but they are possible," stated the lead researcher who oversaw the research. "The nation has been formulating policy in the absence of the frameworks to test against extreme possibilities. We've now supplied planners what they need to plan for climate outcomes they hope never happen, but can’t afford to ignore."

A Spectrum of Extreme Weather Possibilities

A second set of dire projections details the projected severity of harsh climate between now and the end of the century. These indicate that thermometer readings could skyrocket in some months by up to 6C above average, while rainfall could be 300% of standard measurements.

The chance of the catastrophic events coming to pass cannot be precisely determined due to a lack of certainty about what measures will be enacted to combat global warming and how the planet's climate will react. This analysis was compared to security threat evaluations or resilience checks for economic stability.

Key Scenario Details

• Severe Heating: Planetary heating soaring past 4C by 2100 could occur if emissions cuts breaks down or if vicious cycles such as the tropical forests perishing release its huge repository of carbon. This would lead to extreme and prolonged heat domes and water shortages hitting the UK in summer.
• Ocean Circulation Failure: A critical sea current, the Atlantic meridional overturning circulation (Amoc), is slowing down and becoming unstable due to ocean warming. A collapse starting around 2030 would lead to a six-degree temperature drop in the UK. "Crop production would be severely challenged and water supplies would be drastically changed," said Arnell.
• Rapid Sea Level Rise: A rise of 2.0-2.2 metres around the UK by 2100 could happen if polar ice in the Arctic and Antarctic collapse rapidly, submerging coastal cities and towns. Differing from the other scenarios, this possibility is already recognized by planners.
• Clean Air Warming: Global averages could also be driven up by about 0.75C if airborne particulates is drastically reduced. This paradoxical outcome occurs because aerosol particles from burning coal reflect solar radiation from warming the ground.

Building Resilience Against the Extreme

The severe models could be applied to guide the building of major projects, including new towns, energy plants and urban drainage systems. Awareness of these environmental threats could also accelerate the transition to reduce carbon pollution.

The research developed 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 geopolitical instability.

The research was initiated as part of a national climate resilience programme. Previous assessments have cautioned that insufficient focus was being paid to high-consequence, low-probability risks.

An independent advisory body has stated that the UK needs to "prepare for two degrees of warming" and assess the risks for severe warming. Past policy documents have been described as being "insufficient" by some observers.

A government spokesperson commented: "Global warming is at the core of this government’s agenda, both adapting for the future and becoming a renewable energy leader. It is crucial that the UK is prepared for the impacts."