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The gravest potential impacts of the climate crisis for the UK have been detailed by scientists, including a blistering 4C jump in mean temperatures to a two-metre increase in sea levels. A separate possibility foresees a decline of 6C in temperature following the failure of crucial Atlantic Ocean currents, which would massively disrupt farming and energy needs.

Possible Extremes, Not Guarantees

These impacts, a number of which are connected to critical climate thresholds, are considered as improbable but credible. The researchers explained that these models addressed a shortfall in risk assessment that had rendered the UK not ready for worst-case results.

"The severe weather events we have detailed aren’t predictions, but they are credible," said the professor who directed the analysis. "Britain has been formulating policy in the absence of the methods to assess worst-case scenarios. We've now supplied policymakers what they need to get ready for environmental results they wish to avoid, but dare not dismiss."

A Spectrum of Harsh Climate Projections

A further series of dire projections sets out the possible scale of severe conditions between now and the year 2100. These indicate that thermometer readings could skyrocket in certain periods by up to 6C above the norm, while rainfall could be triple standard measurements.

The probability of the catastrophic events occurring could not be calculated due to a lack of certainty about what steps will be enacted to tackle global heating and how the Earth's systems will react. This analysis was described as similar to defence planning or stress tests for the banking sector.

Major Outcome Details

• Severe Heating: Worldwide averages rising well above 4C by 2100 could transpire if emissions cuts fails or if strong feedback loops including the Amazon rainforest dying emit its vast reserves of carbon. This would result in extreme and prolonged heatwaves and droughts affecting the UK in summer.
• Atlantic Current Collapse: A key circulation system, the AMOC, is weakening and losing stability due to global heating. A full shutdown starting around 2030 would lead to a 6C cooling in the UK. "Crop production would face immense difficulties and freshwater availability would be fundamentally reshaped," explained the professor.
• Sudden Ocean Inundation: A rise of 2.0-2.2 metres around the UK by 2100 could happen if polar ice in Greenland and Antarctica disintegrate quickly, submerging low-lying areas. Differing from the other scenarios, this possibility is already known by coastal engineers.
• Clean Air Warming: Global averages could also be increased by about 0.75C if industrial aerosols is drastically reduced. This paradoxical outcome occurs because aerosol particles from fossil fuel combustion block sunlight from warming the ground.

Preparing for the Unthinkable

These dire projections could be utilized in planning the development of major projects, including new towns, nuclear power stations and urban drainage systems. Understanding these future hazards could also speed the drive to slash fossil fuel emissions.

The research formulated the extreme models using a mix of past data and records, climate models and established principles. The scenarios omit potential global problems including the devastation of food supplies and increased conflict.

The research was requested as part of a government’s risk assessment framework. Independent analyses have warned that too little consideration was being paid to high-consequence, low-probability risks.

Official experts has recommended that the UK must "become resilient to moderate heating" and evaluate the dangers for 4C. Past policy documents have been criticised as being "inadequate" by some observers.

An official statement commented: "The climate emergency is at the heart of this government’s agenda, both preparing for impacts and establishing itself as a low-carbon economy. It is crucial that the UK is ready for the consequences."