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The most severe possible consequences of the climate crisis for the UK have been detailed by researchers, encompassing a scorching 4C rise in temperatures to a 2-metre surge in ocean levels. A separate possibility predicts a plunge of 6C in temperatures following the failure of crucial Atlantic Ocean currents, which would profoundly upset agriculture and energy demand.

Plausible Outcomes, Not Predictions

These impacts, some of which are connected to climate tipping points, are seen as improbable but possible. The researchers stated that these models filled a gap in forecasting that had rendered the UK ill-prepared for catastrophic possibilities.

"The severe weather events we have mapped aren’t predictions, but they are plausible," stated the professor who led the study. "The nation has been planning lacking the methods to assess extreme possibilities. We've now provided policymakers what they need to plan for future conditions they pray never occur, but dare not dismiss."

A Suite of Extreme Weather Possibilities

A further series of dire projections details the projected severity of severe conditions between now and the close of the 2100s. These suggest that temperatures could soar in some months by up to 6C higher than average, while precipitation could be three times typical amounts.

The likelihood of the worst-case outcomes coming to pass could not be calculated due to uncertainty about what steps will be taken to combat climate change and how the planet's climate will behave. This analysis was compared to defence planning or stress tests for financial systems.

Critical Scenario Elements

• 4C Temperature Rise: Worldwide averages exceeding 4C by 2100 could happen if climate action breaks down or if strong feedback loops such as the tropical forests becoming a net carbon source emit its enormous store of carbon. This would result in severe and lengthy heat domes and water shortages hitting the UK in summer.
• AMOC Shutdown: A critical sea current, the North Atlantic current, is slowing down and becoming unstable due to climate change. A complete failure commencing by 2030 would lead to a drastic cooling in the UK. "Crop production would face immense difficulties and water resources would be drastically changed," noted the lead researcher.
• Sudden Ocean Inundation: A increase of 2.0-2.2 metres around the UK by 2100 could occur if glaciers in the Arctic and Antarctic melt abruptly, submerging seaside communities. Differing from the other scenarios, this possibility is already understood by infrastructure experts.
• Clean Air Warming: Temperatures could also be driven up by about 0.75C if pollution from industry is drastically reduced. This counterintuitive effect occurs because tiny specks from burning coal reflect solar radiation from warming the ground.

Building Resilience Against the Worst

The worst-case scenarios could be utilized in planning the building of major projects, including new towns, energy plants and flood defences. Awareness of these future hazards could also hasten the drive to reduce fossil fuel emissions.

The study formulated the worst-case scenarios using a mix of past data and records, computer simulations and climate physics. The possibilities exclude broader worldwide issues such as the global food shortages and resource wars.

The research was initiated as part of a national adaptation planning initiative. Earlier reports have warned that insufficient focus was being given to low‐likelihood but high‐impact risks.

An independent advisory body has recommended that the UK needs to "prepare for two degrees of warming" and evaluate the dangers for 4C. Past policy documents have been criticised as being "very weak" by some observers.

A government spokesperson commented: "Global warming is at the core of the country's focus, both building resilience and becoming a clean energy superpower. It is essential that the UK is prepared for the impacts."