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The gravest projected effects of the climate crisis for the UK have been mapped by scientists, ranging from a scorching 4C increase in mean temperatures to a 2-metre surge in sea level. An alternative projection envisions a plunge of 6C in temperature following the failure of key Atlantic Ocean currents, which would massively disrupt food production and energy demand.

Possible Events, Not Predictions

These impacts, a number of which are linked to irreversible climate shifts, are considered as unlikely but credible. The team explained that these projections filled a gap in forecasting that had rendered the UK not ready for worst-case results.

"The worst-case scenarios we have mapped should not be seen as certainties, but they are plausible," stated Nigel Arnell who led the research. "Britain has been planning in the absence of the tools to plan for extreme possibilities. We've now provided planners what they need to plan for future conditions they hope never happen, but can’t afford to ignore."

A Range of Harsh Climate Projections

A second set of dire projections details the possible scale of extreme weather between now and the year 2100. These suggest that thermometer readings could rocket in some months by up to 6C above historical levels, while rainfall could be triple standard measurements.

The likelihood of the extreme scenarios coming to pass could not be calculated due to unknown factors about what action will be taken to tackle global warming and how the climate system will behave. This analysis was likened to national security risk assessments or stress tests for financial systems.

Major Possibility Details

• Four-Degree Warming: Planetary heating exceeding 4C by 2100 could happen if climate action fails or if powerful amplifying effects like the Amazon basin perishing emit its huge repository of carbon. This would cause severe and lengthy heatwaves and droughts plaguing the UK in summer.
• Atlantic Current Collapse: A key circulation system, the AMOC, is slowing down and showing signs of collapse due to global heating. A collapse commencing by 2030 would lead to a drastic cooling in the UK. "Crop production would face immense difficulties and water resources would be completely altered," noted the professor.
• Sudden Ocean Inundation: A increase of 2.0-2.2 metres around the UK by 2100 could happen if polar ice in the Arctic and Antarctic melt abruptly, inundating seaside communities. Differing from the other scenarios, this risk is already recognized by coastal engineers.
• Clean Air Warming: Temperatures could also be driven up by about 0.75C if airborne particulates is sharply cut. This paradoxical outcome occurs because tiny specks from burning coal reflect solar radiation from warming the ground.

Preparing for the Extreme

The worst-case scenarios could be utilized in planning the construction of major projects, such as expanded cities, nuclear power stations and flood defences. Knowledge about these climate risks could also accelerate the drive to slash greenhouse gas emissions.

The analysis developed the worst-case scenarios using a combination of real-world events, climate models and established principles. These outcomes do not take into account potential global problems including the agricultural collapse and resource wars.

The project was initiated as part of a official climate resilience programme. Independent analyses have cautioned that insufficient focus was being paid to catastrophic yet improbable risks.

Official experts has stated that the UK needs to "become resilient to moderate heating" and examine the dangers for 4C. Previous adaptation plans have been labeled being "inadequate" by certain experts.

An official statement said: "The climate emergency is at the heart of the country's focus, both building resilience and transitioning to a renewable energy leader. It is vital that the UK is ready for the consequences."