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The direst projected effects of the climate emergency for the UK have been outlined by scientists, including a scorching 4C increase in average temperatures to a 6.5-foot increase in sea level. An alternative projection foresees a plunge of 6C in temperature following the failure of key Atlantic Ocean currents, which would massively disrupt food production and energy demand.

Possible Extremes, Not Forecasts

These effects, some of which are associated with critical climate thresholds, are viewed as low probability but plausible. The researchers stated that these models filled a gap in risk assessment that had left the UK ill-prepared for catastrophic possibilities.

"The severe weather events we have mapped should not be seen as certainties, but they are plausible," stated the professor who oversaw the analysis. "The nation has been planning lacking the frameworks to test against catastrophic outcomes. We've now given policymakers what they need to get ready for future conditions they wish to avoid, but can’t afford to ignore."

A Suite of Extreme Weather Possibilities

Another collection of dire projections details the projected severity of harsh climate between now and the close of the 2100s. These show that temperatures could skyrocket in some months by up to 6C above historical levels, while precipitation could be three times typical amounts.

The chance of the extreme scenarios occurring could not be calculated due to uncertainty about what steps will be taken to combat global heating and how the climate system will react. This research was likened to defence planning or resilience checks for economic stability.

Major Scenario Elements

• Four-Degree Warming: Worldwide averages exceeding 4C by 2100 could occur if international cooperation fails or if powerful amplifying effects including the Amazon basin dying emit its vast reserves of carbon. This would lead to extreme and prolonged heat domes and water shortages affecting the UK in summer.
• Ocean Circulation Failure: A key circulation system, the Atlantic meridional overturning circulation (Amoc), is weakening and showing signs of collapse due to global heating. A complete failure starting around 2030 would lead to a 6C cooling in the UK. "Farming would be severely challenged and water resources would be drastically changed," explained the lead researcher.
• Accelerated Coastal Flooding: A increase of 2.0-2.2 metres around the UK by 2100 could occur if ice sheets in Greenland and Antarctica melt abruptly, inundating coastal cities and towns. In contrast to the other scenarios, this threat is already recognized by infrastructure experts.
• Aerosol Effect: Temperatures could also be increased by about 0.75C if industrial aerosols is rapidly cleaned up. This counterintuitive effect occurs because aerosol particles from industrial activity scatter sunlight from warming the ground.

Building Resilience Against the Extreme

The worst-case scenarios could be used to inform the construction of major projects, including housing developments, energy plants and flood defences. Understanding these climate risks could also accelerate the push to cut fossil fuel emissions.

The research developed the severe projections using a mix of real-world events, climate models and scientific theory. These outcomes do not take into account broader worldwide issues such as the devastation of food supplies and resource wars.

This work was initiated as part of a government’s adaptation planning initiative. Independent analyses have cautioned that insufficient focus was being given to high-consequence, low-probability risks.

An independent advisory body has stated that the UK needs to "prepare for two degrees of warming" and assess the risks for four degrees. Past policy documents have been labeled being "very weak" by environmental groups.

An official statement said: "The climate emergency is at the heart of this government’s agenda, both preparing for impacts and transitioning to a renewable energy leader. It is vital that the UK is prepared for the consequences."