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The most severe potential impacts of the global heating for the UK have been mapped by researchers, including a blistering 4C increase in average temperatures to a two-metre rise in ocean levels. An alternative projection envisions a drop of 6C in temperatures following the shutdown of critical Atlantic Ocean currents, which would profoundly upset agriculture and energy needs.

Credible Extremes, Not Guarantees

These consequences, certain ones are connected to irreversible climate shifts, are viewed as improbable but credible. The team said that these models filled a gap in planning that had left the UK not ready for catastrophic possibilities.

"The worst-case scenarios we have detailed are not forecasts, but they are credible," commented Nigel Arnell who led the analysis. "Britain has been making preparations lacking the frameworks to plan for catastrophic outcomes. We've now given decision-makers what they need to plan for future conditions they pray never occur, but must not overlook."

A Suite of Extreme Weather Projections

Another collection of worst-case scenarios sets out the possible scale of harsh climate between now and the end of the century. These show that thermometer readings could skyrocket in some months by up to 6C above historical levels, while rainfall could be 300% of standard measurements.

The chance of the catastrophic events occurring remains uncertain due to unknown factors about what steps will be enacted to combat global heating and how the planet's climate will behave. This approach was compared to security threat evaluations or resilience checks for economic stability.

Key Scenario Highlights

• Severe Heating: Global temperatures exceeding 4C by 2100 could transpire if international cooperation collapses or if powerful amplifying effects including the tropical forests dying release its vast reserves of carbon. This would cause severe and lengthy heat domes and droughts hitting the UK in summer.
• AMOC Shutdown: A key circulation system, the North Atlantic current, is slowing down and becoming unstable due to global heating. A full shutdown commencing by 2030 would lead to a 6C cooling in the UK. "Farming would face immense difficulties and water resources would be drastically changed," said the professor.
• Accelerated Coastal Flooding: A increase of 2.0-2.2 metres around the UK by 2100 could occur if glaciers in the Arctic and Antarctic melt abruptly, submerging low-lying areas. In contrast to the other scenarios, this possibility is already known by infrastructure experts.
• Clean Air Warming: Temperatures could also be driven up by about 0.75C if pollution from industry is drastically reduced. This unexpected result occurs because pollution particles from burning coal scatter solar radiation from reaching the ground.

Planning for the Extreme

The severe models could be utilized in planning the development of critical national infrastructure, for example housing developments, nuclear power stations and urban drainage systems. Understanding these climate risks could also speed the push to slash fossil fuel emissions.

The study developed the severe projections using a mix of observed and historical experience, climate models and scientific theory. The scenarios exclude broader worldwide issues like the global food shortages and increased conflict.

The research was requested as part of a official climate resilience programme. Independent analyses have warned that insufficient focus was being allocated to catastrophic yet improbable risks.

An independent advisory body has said that the UK needs to "prepare for two degrees of warming" and evaluate the dangers for severe warming. Earlier government strategies have been criticised as being "insufficient" by certain experts.

A government spokesperson noted: "Climate change is at the heart of our national priorities, both preparing for impacts and establishing itself as a clean energy superpower. It is vital that the UK is prepared for the impacts."