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The direst possible consequences of the global heating for the UK have been detailed by scientists, encompassing a blistering 4C jump in average temperatures to a 6.5-foot rise in ocean levels. An alternative projection envisions a drop of 6C in temperature following the shutdown of key Atlantic Ocean currents, which would severely impact food production and energy needs.

Credible Extremes, Not Guarantees

These effects, certain ones are connected to critical climate thresholds, are considered as improbable but credible. The team said that these scenarios filled a gap in forecasting that had rendered the UK ill-prepared for catastrophic possibilities.

"The climate extremes we have mapped aren’t predictions, but they are possible," said Nigel Arnell who oversaw the analysis. "The nation has been formulating policy lacking the methods to test against worst-case scenarios. We've now provided planners what they need to prepare for future conditions they wish to avoid, but must not overlook."

A Range of Severe Conditions Projections

Another collection of dire projections sets out the potential extent of harsh climate between now and the year 2100. These show that thermometer readings could soar in certain periods by up to 6C above historical levels, while rainfall could be triple normal levels.

The likelihood of the catastrophic events coming to pass remains uncertain due to uncertainty about what measures will be taken to tackle climate change and how the planet's climate will react. This approach was likened to national security risk assessments or stress tests for economic stability.

Critical Possibility Highlights

• Four-Degree Warming: Worldwide averages exceeding 4C by 2100 could occur if international cooperation breaks down or if strong feedback loops including the tropical forests becoming a net carbon source unleash its enormous store of carbon. This would result in extreme and prolonged heat domes and dry spells affecting the UK in summer.
• Ocean Circulation Failure: A key circulation system, the AMOC, is weakening and becoming unstable due to ocean warming. A collapse beginning in 2030 would lead to a drastic cooling in the UK. "Farming would be severely challenged and water resources would be drastically changed," explained the professor.
• Accelerated Coastal Flooding: A increase of 2.0-2.2 metres around the UK by 2100 could happen if ice sheets in the polar regions melt abruptly, inundating seaside communities. Differing from the other scenarios, this risk is already known by coastal engineers.
• Clean Air Warming: Global averages could also be pushed higher by about 0.75C if airborne particulates is sharply cut. This unexpected result occurs because pollution particles from industrial activity scatter sunlight from warming the ground.

Planning for the Worst

These dire projections could be applied to guide the development of major projects, for example expanded cities, power generation facilities and water management networks. Understanding these climate risks could also speed the push to reduce greenhouse gas emissions.

The study developed the severe projections using a blend of past data and records, digital projections and established principles. The possibilities do not take into account broader worldwide issues such as the global food shortages and geopolitical instability.

The research was initiated as part of a government’s climate resilience programme. Independent analyses have warned that not enough attention was being given to catastrophic yet improbable risks.

The government's climate advisors has recommended that the UK needs to "adapt to 2C" and evaluate the dangers for 4C. Past policy documents have been described as being "insufficient" by certain experts.

An official statement commented: "Climate change is at the heart of our national priorities, both preparing for impacts and establishing itself as a clean energy superpower. It is crucial that the UK is prepared for the consequences."