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The gravest possible consequences of the global heating for the UK have been mapped by scientists, including a scorching 4C rise in mean temperatures to a 6.5-foot increase in ocean levels. Another scenario foresees a plunge of 6C in temperatures following the failure of crucial Atlantic Ocean currents, which would massively disrupt agriculture and power requirements.

Credible Outcomes, Not Predictions

These impacts, a number of which are connected to climate tipping points, are considered as improbable but plausible. The researchers stated that these models filled a gap in risk assessment that had rendered the UK unprepared for extreme outcomes.

"The worst-case scenarios we have outlined should not be seen as certainties, but they are credible," commented the lead researcher who oversaw the analysis. "The nation has been formulating policy in the absence of the frameworks to plan for catastrophic outcomes. We've now supplied policymakers what they need to get ready for climate outcomes they wish to avoid, but can’t afford to ignore."

A Suite of Harsh Climate Possibilities

A second set of dire projections maps the potential extent of extreme weather between now and the year 2100. These suggest that temperatures could rocket in some months by up to 6C higher than historical levels, while rainfall could be triple standard measurements.

The likelihood of the catastrophic events occurring could not be calculated due to unknown factors about what action will be taken to address global warming and how the climate system will behave. This research was compared to defence planning or resilience checks for financial systems.

Key Possibility Details

• Four-Degree Warming: Global temperatures soaring past 4C by 2100 could transpire if international cooperation collapses or if vicious cycles including the tropical forests dying unleash its vast reserves of carbon. This would lead to extreme and prolonged heatwaves and dry spells plaguing the UK in summer.
• Ocean Circulation Failure: A critical sea current, the AMOC, is losing strength and becoming unstable due to climate change. A full shutdown commencing by 2030 would lead to a drastic cooling in the UK. "Agriculture would face immense difficulties and water resources would be drastically changed," noted Arnell.
• Sudden Ocean Inundation: A rise of 2.0-2.2 metres around the UK by 2100 could occur if glaciers in the polar regions melt abruptly, flooding coastal cities and towns. In contrast to the other scenarios, this possibility is already recognized by planners.
• Aerosol Effect: Temperatures could also be driven up by about 0.75C if industrial aerosols is drastically reduced. This paradoxical outcome occurs because tiny specks from burning coal block sunlight from warming the ground.

Building Resilience Against the Extreme

The severe models could be applied to guide the development of critical national infrastructure, such as expanded cities, energy plants and water management networks. Awareness of these future hazards could also accelerate the transition to reduce greenhouse gas emissions.

The study created the extreme models using a combination of past data and records, climate models and established principles. These outcomes exclude potential global problems including the global food shortages and increased conflict.

The research was requested as part of a government’s risk assessment framework. Previous assessments have warned that not enough attention was being paid to low‐likelihood but high‐impact risks.

The government's climate advisors has said that the UK needs to "become resilient to moderate heating" and assess the threats for severe warming. Past policy documents have been labeled being "very weak" by some observers.

A government spokesperson said: "Global warming is at the heart of the country's focus, both building resilience and establishing itself as a renewable energy leader. It is crucial that the UK is prepared for the effects."