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The gravest possible consequences of the global heating for the UK have been outlined by researchers, encompassing a blistering 4C rise in temperatures to a 6.5-foot increase in sea level. Another scenario envisions a decline of 6C in temperatures following the collapse of critical Atlantic Ocean currents, which would severely impact agriculture and energy demand.

Plausible Events, Not Predictions

These consequences, some of which are associated with climate tipping points, are seen as improbable but possible. The scientists said that these models filled a gap in planning that had left the UK not ready for catastrophic possibilities.

"The worst-case scenarios we have outlined aren’t predictions, but they are plausible," commented the professor who oversaw the research. "Britain has been planning lacking the tools to plan for extreme possibilities. We've now supplied decision-makers what they need to prepare for climate outcomes they wish to avoid, but can’t afford to ignore."

A Suite of Harsh Climate Projections

A further series of dire projections maps the potential extent of severe conditions between now and the year 2100. These show that temperatures could skyrocket in certain periods by up to 6C above the norm, while precipitation could be three times standard measurements.

The chance of the catastrophic events coming to pass cannot be precisely determined due to unknown factors about what action will be enacted to combat climate change and how the planet's climate will react. This research was compared to security threat evaluations or scenario planning for financial systems.

Major Possibility Elements

• Four-Degree Warming: Planetary heating rising well above 4C by 2100 could happen if international cooperation fails or if powerful amplifying effects like the tropical forests perishing emit 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 major ocean current, the Atlantic meridional overturning circulation (Amoc), is slowing down and becoming unstable due to global heating. A collapse beginning in 2030 would lead to a 6C cooling in the UK. "Agriculture would be severely challenged and water resources would be drastically changed," noted the lead researcher.
• Sudden Ocean Inundation: A rise of 2.0-2.2 metres around the UK by 2100 could take place if polar ice in Greenland and Antarctica melt abruptly, inundating low-lying areas. In contrast to the other scenarios, this risk is already known by coastal engineers.
• Clean Air Warming: Temperatures could also be driven up by about 0.75C if industrial aerosols is rapidly cleaned up. This paradoxical outcome occurs because tiny specks from fossil fuel combustion scatter sunlight from warming the ground.

Building Resilience Against the Extreme

The severe models could be used to inform the construction of long-term infrastructure, including expanded cities, nuclear power stations and flood defences. Awareness of these environmental threats could also speed the push to reduce carbon pollution.

The analysis formulated the extreme models using a combination of observed and historical experience, computer simulations and climate physics. The scenarios omit broader worldwide issues including the agricultural collapse and resource wars.

The research was initiated as part of a national climate resilience programme. Earlier reports have warned that not enough attention was being allocated to high-consequence, low-probability risks.

Official experts has recommended that the UK must "prepare for two degrees of warming" and evaluate the dangers for four degrees. Earlier government strategies have been described as being "very weak" by some observers.

A national response commented: "Global warming is at the center of this government’s agenda, both adapting for the future and establishing itself as a renewable energy leader. It is crucial that the UK is prepared for the effects."