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The most severe projected effects of the climate crisis for the UK have been outlined by experts, including a scorching 4C increase in average temperatures to a 2-metre surge in ocean levels. Another scenario foresees a decline of 6C in temperature following the failure of critical Atlantic Ocean currents, which would severely impact agriculture and power requirements.

Plausible Extremes, Not Predictions

These effects, some of which are connected to climate tipping points, are seen as low probability but plausible. The scientists stated that these projections filled a gap in planning that had rendered the UK ill-prepared for catastrophic possibilities.

"The worst-case scenarios we have mapped should not be seen as certainties, but they are plausible," commented the lead researcher who led the study. "The nation has been making preparations lacking the frameworks to test against catastrophic outcomes. We've now given decision-makers what they need to get ready for climate outcomes they wish to avoid, but must not overlook."

A Range of Severe Conditions Possibilities

A further series of severe models sets out the possible scale of severe conditions between now and the close of the 2100s. These show that thermometer readings could skyrocket in particular seasons by up to 6C higher than the norm, 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 steps will be taken to address global warming and how the planet's climate will respond. This research was likened to security threat evaluations or stress tests for the banking sector.

Key Scenario Details

• Severe Heating: Planetary heating rising well above 4C by 2100 could happen if emissions cuts fails or if powerful amplifying effects including the Amazon rainforest dying emit its vast reserves of carbon. This would result in intense and enduring heatwaves and dry spells affecting the UK in summer.
• Ocean Circulation Failure: A critical sea current, the North Atlantic current, is losing strength and losing stability due to global heating. A complete failure beginning in 2030 would lead to a six-degree temperature drop in the UK. "Crop production would be severely challenged and water supplies would be drastically changed," noted the professor.
• Accelerated Coastal Flooding: A increase of 2.0-2.2 metres around the UK by 2100 could occur if glaciers in the polar regions disintegrate quickly, flooding coastal cities and towns. In contrast to the other scenarios, this risk is already known by infrastructure experts.
• Pollution Paradox: Temperatures could also be driven up by about 0.75C if airborne particulates is sharply cut. This unexpected result occurs because aerosol particles from burning coal reflect sunlight from reaching the ground.

Preparing for the Extreme

The severe models could be applied to guide the development of critical national infrastructure, such as new towns, energy plants and urban drainage systems. Knowledge about these environmental threats could also speed the push to cut fossil fuel emissions.

The study created the extreme models using a combination of real-world events, computer simulations and established principles. These outcomes exclude international cascading effects such as the devastation of food supplies and geopolitical instability.

This work was requested as part of a government’s climate resilience programme. Earlier reports have cautioned that insufficient focus was being paid to low‐likelihood but high‐impact risks.

The government's climate advisors has recommended that the UK must "adapt to 2C" and evaluate the risks for 4C. Past policy documents have been described as being "very weak" by environmental groups.

A national response noted: "Global warming is at the heart of our national priorities, both building resilience and transitioning to a clean energy superpower. It is essential that the UK is resilient for the effects."