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The direst projected effects of the climate crisis for the UK have been outlined by scientists, ranging from a scorching 4C rise in mean temperatures to a 6.5-foot rise in sea levels. A separate possibility foresees a plunge of 6C in temperatures following the collapse of key Atlantic Ocean currents, which would massively disrupt agriculture and energy demand.

Possible Events, Not Forecasts

These impacts, some of which are associated with critical climate thresholds, are seen as low probability but plausible. The scientists said that these models plugged a hole in forecasting that had left the UK not ready for worst-case results.

"The climate extremes we have mapped should not be seen as certainties, but they are possible," commented the lead researcher who directed the study. "The nation has been formulating policy in the absence of the tools to assess extreme possibilities. We've now provided policymakers what they need to get ready for future conditions they wish to avoid, but can’t afford to ignore."

A Spectrum of Extreme Weather Possibilities

A further series of worst-case scenarios details the projected severity of severe conditions between now and the year 2100. These show that temperatures could soar in some months by up to 6C higher than historical levels, while rainfall could be 300% of typical amounts.

The probability of the catastrophic events coming to pass cannot be precisely determined due to unknown factors about what action will be enacted to combat global warming and how the planet's climate will behave. This research was described as similar to defence planning or scenario planning for economic stability.

Critical Scenario Details

• 4C Temperature Rise: Planetary heating rising well above 4C by 2100 could transpire if emissions cuts breaks down or if powerful amplifying effects including the Amazon rainforest dying unleash its vast reserves of carbon. This would lead to intense and enduring heat domes and droughts plaguing the UK in summer.
• AMOC Shutdown: A major ocean current, the AMOC, is weakening and showing signs of collapse due to global heating. A full shutdown starting around 2030 would lead to a drastic cooling in the UK. "Agriculture would be severely challenged and water supplies would be fundamentally reshaped," said the lead researcher.
• Sudden Ocean Inundation: A surge of 2.0-2.2 metres around the UK by 2100 could take place if ice sheets in the polar regions disintegrate quickly, flooding low-lying areas. In contrast to the other scenarios, this possibility is already recognized by coastal engineers.
• Pollution Paradox: Temperatures could also be driven up by about 0.75C if airborne particulates is rapidly cleaned up. This unexpected result occurs because tiny specks from burning coal block solar radiation from reaching the ground.

Building Resilience Against the Extreme

The severe models could be utilized in planning the building of long-term infrastructure, for example expanded cities, power generation facilities and flood defences. Understanding these future hazards could also accelerate the transition to cut fossil fuel emissions.

The research developed the extreme models using a blend of past data and records, digital projections and scientific theory. The possibilities do not take into account potential global problems including the devastation of food supplies and increased conflict.

This work was initiated as part of a official risk assessment framework. Earlier reports have warned that not enough attention was being allocated to low‐likelihood but high‐impact risks.

The government's climate advisors has recommended that the UK needs to "adapt to 2C" and evaluate the dangers for 4C. Past policy documents have been labeled being "very weak" by environmental groups.

An official statement said: "Climate change is at the core of our national priorities, both adapting for the future and becoming a clean energy superpower. It is vital that the UK is ready for the consequences."