🔗 Share this article

The direst possible consequences of the climate emergency for the UK have been detailed by experts, including a searing 4C jump in average temperatures to a 6.5-foot increase in ocean levels. Another scenario foresees a decline of 6C in temperatures following the shutdown of crucial Atlantic Ocean currents, which would massively disrupt food production and energy needs.

Possible Events, Not Predictions

These consequences, a number of which are associated with critical climate thresholds, are viewed as low probability but possible. The scientists stated that these projections plugged a hole in forecasting that had left the UK ill-prepared for extreme outcomes.

"The severe weather events we have outlined aren’t predictions, but they are possible," commented Nigel Arnell who led the research. "The nation has been making preparations lacking the frameworks to test against worst-case scenarios. We've now supplied planners what they need to plan for future conditions they hope never happen, but must not overlook."

A Spectrum of Harsh Climate Possibilities

A second set of dire projections sets out the potential extent of extreme weather between now and the end of the century. These show that temperatures could soar in particular seasons by up to 6C higher than the norm, while precipitation could be three times typical amounts.

The probability of the extreme scenarios happening could not be calculated due to a lack of certainty about what action will be taken to combat global warming and how the climate system will react. This approach was described as similar to national security risk assessments or resilience checks for economic stability.

Major Possibility Details

• 4C Temperature Rise: Planetary heating soaring past 4C by 2100 could transpire if international cooperation breaks down or if strong feedback loops like the Amazon rainforest perishing unleash its enormous store of carbon. This would lead to severe and lengthy heat domes and droughts plaguing the UK in summer.
• Ocean Circulation Failure: A key circulation system, the Atlantic meridional overturning circulation (Amoc), is losing strength and becoming unstable due to global heating. A full shutdown starting around 2030 would lead to a six-degree temperature drop in the UK. "Agriculture would be severely challenged and water resources would be completely altered," explained the professor.
• Accelerated Coastal Flooding: A increase of 2.0-2.2 metres around the UK by 2100 could take place if polar ice in the Arctic and Antarctic collapse rapidly, inundating seaside communities. In contrast to the other scenarios, this possibility is already known by planners.
• Pollution Paradox: Temperatures could also be increased by about 0.75C if airborne particulates is sharply cut. This unexpected result occurs because aerosol particles from fossil fuel combustion block sunlight from reaching the ground.

Planning for the Unthinkable

These dire projections could be utilized in planning the construction of long-term infrastructure, such as expanded cities, power generation facilities and water management networks. Understanding these future hazards could also speed the drive to reduce greenhouse gas emissions.

The analysis formulated the severe projections using a blend of observed and historical experience, climate models and scientific theory. These outcomes omit international cascading effects like the agricultural collapse and resource wars.

The research was commissioned as part of a national climate resilience programme. Previous assessments have warned that not enough attention was being paid to high-consequence, low-probability risks.

An independent advisory body has stated that the UK must "adapt to 2C" and examine the risks for four degrees. Past policy documents have been labeled being "insufficient" by certain experts.

An official statement commented: "The climate emergency is at the center of our national priorities, both building resilience and establishing itself as a clean energy superpower. It is crucial that the UK is prepared for the consequences."