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The gravest projected effects of the climate emergency for the UK have been detailed by researchers, encompassing a scorching 4C rise in average temperatures to a 6.5-foot rise in ocean levels. A separate possibility predicts a decline of 6C in temperature following the collapse of critical Atlantic Ocean currents, which would severely impact farming and power requirements.

Credible Extremes, Not Guarantees

These consequences, certain ones are connected to climate tipping points, are seen as improbable but plausible. The scientists stated that these projections addressed a shortfall in risk assessment that had rendered the UK ill-prepared for worst-case results.

"The worst-case scenarios we have mapped should not be seen as certainties, but they are plausible," said Nigel Arnell who led the analysis. "The UK has been planning lacking the frameworks to test against extreme possibilities. We've now supplied decision-makers what they need to prepare for environmental results they wish to avoid, but must not overlook."

A Spectrum of Severe Conditions Projections

A further series of worst-case scenarios sets out the possible scale of harsh climate between now and the end of the century. These indicate that temperatures could rocket in some months by up to 6C higher than historical levels, while rainfall could be 300% of normal levels.

The likelihood of the extreme scenarios happening could not be calculated due to a lack of certainty about what measures will be taken to combat climate change and how the planet's climate will respond. This approach was described as similar to security threat evaluations or resilience checks for financial systems.

Key Scenario Highlights

• Severe Heating: Planetary heating rising well above 4C by 2100 could occur if international cooperation breaks down or if powerful amplifying effects including the tropical forests perishing release its huge repository of carbon. This would result in extreme and prolonged heatwaves and droughts plaguing the UK in summer.
• Ocean Circulation Failure: A major ocean current, the North Atlantic current, is slowing down and losing stability due to ocean warming. A complete failure starting around 2030 would lead to a 6C cooling in the UK. "Agriculture would be severely challenged and freshwater availability would be fundamentally reshaped," noted Arnell.
• Rapid Sea Level Rise: A surge of 2.0-2.2 metres around the UK by 2100 could take place if glaciers in Greenland and Antarctica melt abruptly, flooding coastal cities and towns. Unlike the other scenarios, this threat is already known by coastal engineers.
• Pollution Paradox: Temperatures could also be pushed higher by about 0.75C if airborne particulates is drastically reduced. This counterintuitive effect occurs because pollution particles from burning coal block solar radiation from reaching the ground.

Preparing for the Extreme

These dire projections could be applied to guide the construction of critical national infrastructure, including new towns, nuclear power stations and urban drainage systems. Awareness of these future hazards could also accelerate the push to slash carbon pollution.

The analysis created the worst-case scenarios using a blend of real-world events, computer simulations and climate physics. The possibilities omit potential global problems including the agricultural collapse and geopolitical instability.

This work was commissioned as part of a official risk assessment framework. Independent analyses have cautioned that insufficient focus was being paid to high-consequence, low-probability risks.

An independent advisory body has stated that the UK must "become resilient to moderate heating" and evaluate the threats for severe warming. Previous adaptation plans have been labeled being "inadequate" by environmental groups.

A national response commented: "Climate change is at the heart of the country's focus, both building resilience and becoming a clean energy superpower. It is crucial that the UK is prepared for the impacts."