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The most severe potential impacts of the climate crisis for the UK have been detailed by experts, encompassing a scorching 4C rise in temperatures to a 6.5-foot rise in ocean levels. An alternative projection predicts a drop of 6C in temperatures following the collapse of critical Atlantic Ocean currents, which would profoundly upset farming and power requirements.

Credible Extremes, Not Guarantees

These impacts, a number of which are associated with irreversible climate shifts, are considered as improbable but possible. The scientists said that these projections filled a gap in risk assessment that had rendered the UK not ready for worst-case results.

"The worst-case scenarios we have outlined aren’t predictions, but they are credible," commented Nigel Arnell who led the research. "The nation has been formulating policy in the absence of the frameworks to assess catastrophic outcomes. We've now given policymakers what they need to prepare for future conditions they wish to avoid, but must not overlook."

A Range of Severe Conditions Projections

Another collection of worst-case scenarios details the projected severity of harsh climate between now and the year 2100. These indicate that thermometer readings could rocket in particular seasons by up to 6C higher than the norm, while precipitation could be three times standard measurements.

The likelihood of the worst-case outcomes happening cannot be precisely determined due to unknown factors about what action will be implemented to tackle global warming and how the Earth's systems will behave. This research was described as similar to security threat evaluations or stress tests for economic stability.

Critical Possibility Highlights

• Severe Heating: Global temperatures rising well above 4C by 2100 could transpire if international cooperation breaks down or if strong feedback loops like the Amazon rainforest perishing release its vast reserves of carbon. This would lead to severe and lengthy heat domes and water shortages affecting the UK in summer.
• AMOC Shutdown: A major ocean current, the North Atlantic current, is slowing down and becoming unstable due to climate change. A full shutdown beginning in 2030 would lead to a drastic cooling in the UK. "Agriculture would struggle enormously and freshwater availability would be drastically changed," explained Arnell.
• Rapid Sea Level Rise: A increase of 2.0-2.2 metres around the UK by 2100 could occur if glaciers in the polar regions collapse rapidly, inundating low-lying areas. Differing from the other scenarios, this threat is already understood by planners.
• Clean Air Warming: Global averages could also be driven up by about 0.75C if industrial aerosols is drastically reduced. This unexpected result occurs because pollution particles from fossil fuel combustion scatter sunlight from reaching the ground.

Preparing for the Extreme

The severe models could be applied to guide the building of critical national infrastructure, including new towns, power generation facilities and flood defences. Knowledge about these climate risks could also speed the drive to slash carbon pollution.

The research created the severe projections using a combination of past data and records, computer simulations and scientific theory. These outcomes exclude broader worldwide issues including the agricultural collapse and resource wars.

The research was commissioned as part of a official risk assessment framework. Previous assessments have warned that insufficient focus was being paid to high-consequence, low-probability risks.

The government's climate advisors has said that the UK must "become resilient to moderate heating" and assess the risks for four degrees. Earlier government strategies have been described as being "very weak" by environmental groups.

A national response noted: "The climate emergency is at the heart of the country's focus, both building resilience and transitioning to a renewable energy leader. It is essential that the UK is ready for the consequences."