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The most severe possible consequences of the global heating for the UK have been detailed by researchers, including a scorching 4C jump in mean temperatures to a two-metre surge in sea levels. A separate possibility foresees a decline of 6C in temperatures following the failure of crucial Atlantic Ocean currents, which would severely impact agriculture and energy needs.

Plausible Events, Not Guarantees

These consequences, a number of which are linked to critical climate thresholds, are viewed as unlikely but plausible. The team said that these models addressed a shortfall in planning that had left the UK unprepared for worst-case results.

"The worst-case scenarios we have outlined should not be seen as certainties, but they are plausible," commented Nigel Arnell who oversaw the study. "The UK has been formulating policy in the absence of the methods to plan for catastrophic outcomes. We've now given planners what they need to prepare for environmental results they pray never occur, but can’t afford to ignore."

A Suite of Harsh Climate Scenarios

Another collection of worst-case scenarios details the projected severity of severe conditions between now and the close of the 2100s. These indicate that temperatures could rocket in particular seasons by up to 6C higher than average, while rainfall could be 300% of typical amounts.

The probability of the catastrophic events occurring cannot be precisely determined due to a lack of certainty about what measures will be taken to tackle global heating and how the planet's climate will react. This analysis was described as similar to defence planning or stress tests for economic stability.

Major Outcome Highlights

• 4C Temperature Rise: Worldwide averages soaring past 4C by 2100 could happen if emissions cuts collapses or if powerful amplifying effects such as the Amazon basin dying unleash its enormous store of carbon. This would cause extreme and prolonged heat domes and dry spells plaguing the UK in summer.
• Atlantic Current Collapse: A critical sea current, the Atlantic meridional overturning circulation (Amoc), is losing strength and becoming unstable due to ocean warming. A collapse beginning in 2030 would lead to a drastic cooling in the UK. "Farming would face immense difficulties and freshwater availability would be fundamentally reshaped," noted Arnell.
• Sudden Ocean Inundation: A rise of 2.0-2.2 metres around the UK by 2100 could take place if polar ice in the Arctic and Antarctic melt abruptly, inundating coastal cities and towns. Differing from the other scenarios, this threat is already recognized by infrastructure experts.
• Pollution Paradox: Temperatures could also be pushed higher by about 0.75C if industrial aerosols is sharply cut. This paradoxical outcome occurs because pollution particles from burning coal block sunlight from reaching the ground.

Building Resilience Against the Unthinkable

The worst-case scenarios could be used to inform the building of major projects, including expanded cities, power generation facilities and water management networks. Knowledge about these climate risks could also speed the transition to slash greenhouse gas emissions.

The research developed the severe projections using a blend of real-world events, digital projections and established principles. The possibilities exclude broader worldwide issues including the devastation of food supplies and increased conflict.

The research was commissioned as part of a official adaptation planning initiative. Earlier reports have cautioned that insufficient focus was being paid to high-consequence, low-probability risks.

The government's climate advisors has said that the UK must "adapt to 2C" and evaluate the dangers for 4C. Previous adaptation plans have been criticised as being "very weak" by environmental groups.

An official statement noted: "Global warming is at the center of our national priorities, both preparing for impacts and becoming a low-carbon economy. It is essential that the UK is resilient for the effects."