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The direst projected effects of the global heating for the UK have been outlined by experts, including a blistering 4C increase in average temperatures to a 2-metre surge in sea levels. A separate possibility foresees a decline of 6C in temperature following the collapse of key Atlantic Ocean currents, which would massively disrupt farming and power requirements.

Plausible Events, Not Guarantees

These impacts, a number of which are associated with irreversible climate shifts, are considered as unlikely but plausible. The team explained that these projections filled a gap in planning that had left the UK unprepared for worst-case results.

"The severe weather events we have mapped aren’t predictions, but they are credible," commented the professor who led the study. "The UK has been making preparations in the absence of the tools to test against extreme possibilities. We've now provided decision-makers what they need to prepare for climate outcomes they wish to avoid, but must not overlook."

A Suite of Harsh Climate Projections

A further series of worst-case scenarios details the possible scale of harsh climate between now and the year 2100. These show that temperatures could soar in particular seasons by up to 6C higher than average, while precipitation could be three times standard measurements.

The likelihood of the extreme scenarios happening remains uncertain due to a lack of certainty about what action will be implemented to tackle climate change and how the climate system will behave. This research was compared to security threat evaluations or scenario planning for financial systems.

Major Possibility Details

• Four-Degree Warming: Planetary heating rising well above 4C by 2100 could happen if climate action fails or if strong feedback loops like the tropical forests dying unleash its vast reserves of carbon. This would result in extreme and prolonged heat domes and droughts hitting the UK in summer.
• Atlantic Current Collapse: A key circulation system, the North Atlantic current, is losing strength and losing stability due to climate change. A complete failure commencing by 2030 would lead to a 6C cooling in the UK. "Agriculture would face immense difficulties and freshwater availability would be completely altered," noted the lead researcher.
• Rapid Sea Level Rise: A increase of 2.0-2.2 metres around the UK by 2100 could occur if polar ice in Greenland and Antarctica disintegrate quickly, inundating seaside communities. Differing from the other scenarios, this possibility is already understood by infrastructure experts.
• Clean Air Warming: Temperatures could also be increased by about 0.75C if airborne particulates is sharply cut. This paradoxical outcome occurs because aerosol particles from burning coal reflect sunlight from reaching the ground.

Planning for the Worst

The severe models could be applied to guide the development of major projects, such as expanded cities, energy plants and water management networks. Knowledge about these climate risks could also accelerate the drive to cut greenhouse gas emissions.

The analysis developed the worst-case scenarios using a blend of past data and records, climate models and scientific theory. The possibilities omit potential global problems such as the agricultural collapse and geopolitical instability.

The research was requested as part of a government’s climate resilience programme. Previous assessments have warned that insufficient focus was being paid to low‐likelihood but high‐impact risks.

Official experts has stated that the UK must "prepare for two degrees of warming" and assess the risks for four degrees. Previous adaptation plans have been labeled being "inadequate" by certain experts.

A government spokesperson said: "The climate emergency is at the core of this government’s agenda, both building resilience and establishing itself as a low-carbon economy. It is vital that the UK is prepared for the effects."