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The most severe possible consequences of the global heating for the UK have been outlined by experts, ranging from a scorching 4C jump in mean temperatures to a two-metre surge in sea levels. A separate possibility foresees a drop of 6C in temperature following the collapse of critical Atlantic Ocean currents, which would profoundly upset farming and power requirements.

Plausible Extremes, Not Predictions

These consequences, a number of which are linked to climate tipping points, are seen as unlikely but plausible. The scientists said that these scenarios addressed a shortfall in planning that had left the UK not ready for extreme outcomes.

"The worst-case scenarios we have outlined are not forecasts, but they are credible," said the lead researcher who directed the analysis. "The nation has been planning in the absence of the tools to assess worst-case scenarios. We've now provided decision-makers what they need to prepare for future conditions they pray never occur, but can’t afford to ignore."

A Range of Extreme Weather Scenarios

Another collection of dire projections details the possible scale of severe conditions between now and the close of the 2100s. These show that temperatures could skyrocket in certain periods by up to 6C above the norm, while rainfall could be 300% of typical amounts.

The likelihood of the catastrophic events coming to pass could not be calculated due to uncertainty about what action will be taken to combat global heating and how the planet's climate will behave. This approach was described as similar to defence planning or resilience checks for economic stability.

Key Possibility Details

• Severe Heating: Global temperatures exceeding 4C by 2100 could occur if climate action breaks down or if powerful amplifying effects such as the Amazon basin becoming a net carbon source emit its huge repository of carbon. This would cause severe and lengthy heatwaves and dry spells hitting the UK in summer.
• Atlantic Current Collapse: A critical sea current, the North Atlantic current, is losing strength and showing signs of collapse due to climate change. A collapse commencing by 2030 would lead to a six-degree temperature drop in the UK. "Crop production would be severely challenged and water resources would be drastically changed," explained the lead researcher.
• Sudden Ocean Inundation: A rise of 2.0-2.2 metres around the UK by 2100 could occur if polar ice in the polar regions disintegrate quickly, flooding coastal cities and towns. In contrast to the other scenarios, this possibility is already known by planners.
• Aerosol Effect: Temperatures could also be driven up by about 0.75C if pollution from industry is rapidly cleaned up. This unexpected result occurs because pollution particles from burning coal reflect sunlight from reaching the ground.

Planning for the Unthinkable

The severe models could be utilized in planning the building of major projects, including expanded cities, nuclear power stations and water management networks. Awareness of these future hazards could also hasten the drive to cut fossil fuel emissions.

The study created the extreme models using a combination of observed and historical experience, digital projections and established principles. The scenarios omit potential global problems like the global food shortages and resource wars.

The project was initiated as part of a official adaptation planning initiative. Independent analyses have cautioned that insufficient focus was being given to low‐likelihood but high‐impact risks.

The government's climate advisors has recommended that the UK must "become resilient to moderate heating" and assess the risks for 4C. Past policy documents have been described as being "inadequate" by some observers.

A government spokesperson commented: "Climate change is at the center of our national priorities, both preparing for impacts and becoming a renewable energy leader. It is vital that the UK is prepared for the effects."