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The most severe projected effects of the climate crisis for the UK have been mapped by scientists, including a blistering 4C jump in average temperatures to a 6.5-foot increase in sea level. Another scenario predicts a plunge of 6C in temperatures following the shutdown of key Atlantic Ocean currents, which would massively disrupt agriculture and power requirements.

Possible Extremes, Not Guarantees

These consequences, a number of which are linked to critical climate thresholds, are considered as unlikely but possible. The scientists explained that these models filled a gap in forecasting that had left the UK ill-prepared for extreme outcomes.

"The worst-case scenarios we have detailed should not be seen as certainties, but they are plausible," stated the professor who oversaw the study. "Britain has been planning without the tools to assess catastrophic outcomes. We've now provided decision-makers what they need to plan for environmental results they wish to avoid, but must not overlook."

A Spectrum of Severe Conditions Possibilities

Another collection of worst-case scenarios maps the potential extent of extreme weather between now and the close of the 2100s. These indicate that temperatures could soar in some months by up to 6C higher than historical levels, while rainfall could be 300% of standard measurements.

The chance of the worst-case outcomes happening cannot be precisely determined due to a lack of certainty about what steps will be enacted to tackle global warming and how the climate system will behave. This approach was described as similar to security threat evaluations or stress tests for financial systems.

Key Scenario Highlights

• 4C Temperature Rise: Worldwide averages exceeding 4C by 2100 could occur if international cooperation fails or if vicious cycles including the Amazon basin perishing release its huge repository of carbon. This would cause extreme and prolonged heatwaves and droughts affecting the UK in summer.
• Atlantic Current Collapse: A major ocean current, the North Atlantic current, is slowing down and losing stability due to ocean warming. A complete failure commencing by 2030 would lead to a drastic cooling in the UK. "Farming would face immense difficulties and water supplies would be drastically changed," said the lead researcher.
• Sudden Ocean Inundation: A surge of 2.0-2.2 metres around the UK by 2100 could occur if polar ice in the polar regions disintegrate quickly, flooding coastal cities and towns. Unlike the other scenarios, this threat is already known by infrastructure experts.
• Aerosol Effect: Temperatures could also be increased by about 0.75C if industrial aerosols is drastically reduced. This counterintuitive effect occurs because aerosol particles from fossil fuel combustion reflect sunlight from warming the ground.

Preparing for the Unthinkable

The severe models could be applied to guide the building of major projects, including housing developments, power generation facilities and water management networks. Understanding these future hazards could also accelerate the drive to reduce greenhouse gas emissions.

The research formulated the extreme models using a mix of past data and records, computer simulations and established principles. The possibilities omit international cascading effects like the devastation of food supplies and resource wars.

The project was initiated as part of a national risk assessment framework. Independent analyses have warned that too little consideration was being given to catastrophic yet improbable risks.

Official experts has stated that the UK must "adapt to 2C" and assess the risks for 4C. Previous adaptation plans have been criticised as being "very weak" by environmental groups.

A national response commented: "The climate emergency is at the core of this government’s agenda, both building resilience and becoming a low-carbon economy. It is vital that the UK is ready for the effects."