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The most severe possible consequences of the climate crisis for the UK have been detailed by experts, ranging from a scorching 4C increase in mean temperatures to a two-metre rise in ocean levels. A separate possibility predicts a drop of 6C in temperatures following the shutdown of key Atlantic Ocean currents, which would severely impact food production and energy demand.

Plausible Events, Not Guarantees

These consequences, a number of which are associated with critical climate thresholds, are considered as unlikely but credible. The scientists said that these scenarios plugged a hole in risk assessment that had rendered the UK ill-prepared for extreme outcomes.

"The severe weather events we have outlined should not be seen as certainties, but they are plausible," commented Nigel Arnell who directed the study. "The UK has been making preparations without the frameworks to test against worst-case scenarios. We've now supplied policymakers what they need to plan for environmental results they pray never occur, but must not overlook."

A Spectrum of Harsh Climate Scenarios

A second set of severe models details the projected severity of severe conditions between now and the year 2100. These show that temperatures could skyrocket in some months by up to 6C higher than historical levels, while precipitation could be triple standard measurements.

The probability of the extreme scenarios happening could not be calculated due to uncertainty about what action will be enacted to tackle climate change and how the Earth's systems will respond. This approach was described as similar to defence planning or scenario planning for economic stability.

Critical Scenario Elements

• Severe Heating: Global temperatures rising well above 4C by 2100 could occur if emissions cuts fails or if strong feedback loops including the Amazon rainforest dying emit its vast reserves of carbon. This would cause extreme and prolonged heat domes and water shortages plaguing the UK in summer.
• Ocean Circulation Failure: A critical sea current, the North Atlantic current, is weakening and becoming unstable due to climate change. A complete failure beginning in 2030 would lead to a six-degree temperature drop in the UK. "Crop production would face immense difficulties and water supplies would be drastically changed," explained the lead researcher.
• Sudden Ocean Inundation: A increase of 2.0-2.2 metres around the UK by 2100 could occur if glaciers in the polar regions collapse rapidly, inundating coastal cities and towns. In contrast to the other scenarios, this risk is already recognized by infrastructure experts.
• Aerosol Effect: Temperatures could also be pushed higher by about 0.75C if pollution from industry is drastically reduced. This counterintuitive effect occurs because aerosol particles from industrial activity block solar radiation from warming the ground.

Building Resilience Against the Worst

The severe models could be used to inform the construction of major projects, including new towns, nuclear power stations and urban drainage systems. Awareness of these environmental threats could also accelerate the push to cut carbon pollution.

The analysis created the severe projections using a blend of real-world events, digital projections and climate physics. These outcomes do not take into account potential global problems including the agricultural collapse and increased conflict.

The project was commissioned as part of a government’s adaptation planning initiative. Independent analyses have cautioned that not enough attention was being allocated to catastrophic yet improbable risks.

An independent advisory body has stated that the UK needs to "adapt to 2C" and examine the dangers for severe warming. Earlier government strategies have been labeled being "insufficient" by some observers.

A government spokesperson noted: "Climate change is at the center of this government’s agenda, both building resilience and transitioning to a renewable energy leader. It is vital that the UK is prepared for the consequences."