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The gravest potential impacts of the climate emergency for the UK have been outlined by scientists, including a blistering 4C increase in mean temperatures to a two-metre increase in sea level. An alternative projection envisions a drop of 6C in temperatures following the collapse of critical Atlantic Ocean currents, which would massively disrupt farming and energy needs.

Plausible Events, Not Forecasts

These consequences, some of which are connected to climate tipping points, are viewed as low probability but credible. The researchers said that these projections addressed a shortfall in forecasting that had rendered the UK unprepared for extreme outcomes.

"The severe weather events we have outlined aren’t predictions, but they are possible," stated Nigel Arnell who oversaw the study. "Britain has been formulating policy without the frameworks to test against worst-case scenarios. We've now provided decision-makers what they need to plan for future conditions they wish to avoid, but can’t afford to ignore."

A Range of Harsh Climate Projections

A second set of dire projections maps the potential extent of severe conditions between now and the close of the 2100s. These indicate that thermometer readings could skyrocket in some months by up to 6C higher than historical levels, while precipitation could be triple normal levels.

The probability of the catastrophic events coming to pass remains uncertain due to a lack of certainty about what measures will be implemented to address global heating and how the climate system will respond. This analysis was described as similar to security threat evaluations or stress tests for financial systems.

Major Possibility Elements

• Four-Degree Warming: Global temperatures exceeding 4C by 2100 could transpire if international cooperation breaks down or if powerful amplifying effects such as the Amazon rainforest dying emit its huge repository of carbon. This would cause intense and enduring heatwaves and water shortages plaguing the UK in summer.
• Atlantic Current Collapse: A major ocean current, the Atlantic meridional overturning circulation (Amoc), is losing strength and becoming unstable due to global heating. A collapse beginning in 2030 would lead to a 6C cooling in the UK. "Farming would be severely challenged and freshwater availability would be completely altered," explained Arnell.
• Accelerated Coastal Flooding: A increase of 2.0-2.2 metres around the UK by 2100 could occur if ice sheets in the Arctic and Antarctic collapse rapidly, flooding coastal cities and towns. In contrast to the other scenarios, this possibility is already understood by infrastructure experts.
• Pollution Paradox: Temperatures could also be driven up by about 0.75C if pollution from industry is drastically reduced. This counterintuitive effect occurs because tiny specks from fossil fuel combustion block sunlight from reaching the ground.

Planning for the Extreme

The severe models could be utilized in planning the building of long-term infrastructure, such as expanded cities, power generation facilities and urban drainage systems. Awareness of these environmental threats could also accelerate the drive to reduce carbon pollution.

The study created the extreme models using a combination of observed and historical experience, digital projections and established principles. These outcomes exclude potential global problems like the global food shortages and increased conflict.

The project was commissioned as part of a national risk assessment framework. Independent analyses have cautioned that too little consideration was being allocated to high-consequence, low-probability risks.

Official experts has recommended that the UK must "become resilient to moderate heating" and examine the risks for severe warming. Previous adaptation plans have been labeled being "very weak" by environmental groups.

An official statement commented: "The climate emergency is at the core of this government’s agenda, both adapting for the future and transitioning to a clean energy superpower. It is crucial that the UK is resilient for the consequences."