🔗 Share this article

The direst possible consequences of the global heating for the UK have been detailed by researchers, including a searing 4C rise in average temperatures to a 2-metre rise in sea level. Another scenario envisions a drop of 6C in temperatures following the collapse of crucial Atlantic Ocean currents, which would massively disrupt farming and energy needs.

Plausible Extremes, Not Predictions

These effects, a number of which are linked to irreversible climate shifts, are seen as improbable but possible. The researchers explained that these models addressed a shortfall in planning that had left the UK ill-prepared for catastrophic possibilities.

"The worst-case scenarios we have detailed are not forecasts, but they are plausible," said the professor who led the study. "The nation has been planning in the absence of the tools to assess extreme possibilities. We've now given planners what they need to plan for climate outcomes they wish to avoid, but can’t afford to ignore."

A Suite of Extreme Weather Scenarios

Another collection of dire projections details the possible scale of severe conditions between now and the end of the century. These suggest that temperatures could soar in some months by up to 6C higher than the norm, while rainfall could be three times normal levels.

The chance of the extreme scenarios coming to pass remains uncertain due to unknown factors about what action will be taken to combat climate change and how the Earth's systems will react. This analysis was likened to security threat evaluations or stress tests for the banking sector.

Critical Outcome Elements

• Severe Heating: Worldwide averages soaring past 4C by 2100 could occur if international cooperation fails or if strong feedback loops such as the tropical forests perishing release its huge repository of carbon. This would result in extreme and prolonged heatwaves and water shortages hitting the UK in summer.
• AMOC Shutdown: A key circulation system, the North Atlantic current, is weakening and becoming unstable due to climate change. A complete failure commencing by 2030 would lead to a six-degree temperature drop in the UK. "Agriculture would be severely challenged and freshwater availability would be completely altered," explained the professor.
• Accelerated Coastal Flooding: A increase of 2.0-2.2 metres around the UK by 2100 could occur if ice sheets in Greenland and Antarctica disintegrate quickly, inundating low-lying areas. Differing from the other scenarios, this threat is already recognized by infrastructure experts.
• Pollution Paradox: Global averages could also be increased by about 0.75C if airborne particulates is rapidly cleaned up. This paradoxical outcome occurs because pollution particles from burning coal block solar radiation from warming the ground.

Planning for the Worst

These dire projections could be used to inform the construction of major projects, including new towns, nuclear power stations and flood defences. Knowledge about these environmental threats could also accelerate the push to slash carbon pollution.

The analysis formulated the severe projections using a mix of real-world events, digital projections and established principles. The possibilities omit broader worldwide issues including the global food shortages and geopolitical instability.

This work was commissioned as part of a official climate resilience programme. Earlier reports have cautioned that not enough attention was being paid to catastrophic yet improbable risks.

The government's climate advisors has said that the UK needs to "adapt to 2C" and evaluate the threats for four degrees. Previous adaptation plans have been labeled being "inadequate" by environmental groups.

An official statement noted: "Climate change is at the heart of the country's focus, both preparing for impacts and becoming a clean energy superpower. It is essential that the UK is ready for the effects."