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The most severe possible consequences of the climate crisis for the UK have been mapped by researchers, including a blistering 4C jump in average temperatures to a two-metre increase in sea levels. A separate possibility envisions a drop of 6C in temperatures following the shutdown of critical Atlantic Ocean currents, which would massively disrupt food production and power requirements.

Credible Events, Not Guarantees

These consequences, a number of which are associated with climate tipping points, are considered as low probability but credible. The scientists stated that these projections plugged a hole in forecasting that had rendered the UK ill-prepared for worst-case results.

"The climate extremes we have outlined aren’t predictions, but they are plausible," said Nigel Arnell who led the analysis. "The nation has been making preparations without the methods to assess extreme possibilities. We've now provided policymakers what they need to get ready for climate outcomes they hope never happen, but dare not dismiss."

A Suite of Harsh Climate Possibilities

Another collection of dire projections details the potential extent of severe conditions between now and the year 2100. These show that temperatures could skyrocket in particular seasons by up to 6C higher than historical levels, while precipitation could be triple typical amounts.

The probability of the worst-case outcomes coming to pass could not be calculated due to unknown factors about what action will be implemented to combat climate change and how the climate system will behave. This research was described as similar to security threat evaluations or stress tests for the banking sector.

Major Possibility Elements

• 4C Temperature Rise: Global temperatures rising well above 4C by 2100 could occur if climate action fails or if powerful amplifying effects like the Amazon basin perishing unleash its huge repository of carbon. This would lead to intense and enduring heat domes and droughts plaguing the UK in summer.
• Ocean Circulation Failure: A critical sea current, the Atlantic meridional overturning circulation (Amoc), is losing strength and showing signs of collapse due to climate change. A full shutdown starting around 2030 would lead to a drastic cooling in the UK. "Farming would struggle enormously and water resources would be drastically changed," explained Arnell.
• Sudden Ocean Inundation: A increase of 2.0-2.2 metres around the UK by 2100 could happen if ice sheets in the polar regions collapse rapidly, flooding seaside communities. In contrast to the other scenarios, this threat is already known by planners.
• Pollution Paradox: Global averages could also be driven up by about 0.75C if industrial aerosols is sharply cut. This unexpected result occurs because aerosol particles from industrial activity scatter solar radiation from reaching the ground.

Planning for the Worst

These dire projections could be utilized in planning the construction of critical national infrastructure, such as new towns, power generation facilities and water management networks. Knowledge about these environmental threats could also speed the transition to reduce fossil fuel emissions.

The study formulated the severe projections using a mix of past data and records, digital projections and scientific theory. The possibilities omit international cascading effects including the global food shortages and resource wars.

This work was initiated as part of a official risk assessment framework. Independent analyses have cautioned that not enough attention was being paid to high-consequence, low-probability risks.

Official experts has said that the UK must "become resilient to moderate heating" and examine the threats for severe warming. Previous adaptation plans have been labeled being "inadequate" by certain experts.

An official statement commented: "Global warming is at the core of our national priorities, both preparing for impacts and transitioning to a renewable energy leader. It is essential that the UK is ready for the effects."