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The most severe projected effects of the climate crisis for the UK have been detailed by researchers, ranging from a scorching 4C rise in average temperatures to a 6.5-foot surge in sea levels. A separate possibility predicts a drop of 6C in temperature following the collapse of crucial Atlantic Ocean currents, which would massively disrupt agriculture and energy needs.

Possible Events, Not Guarantees

These impacts, some of which are connected to irreversible climate shifts, are viewed as improbable but plausible. The researchers explained that these models filled a gap in risk assessment that had left the UK not ready for extreme outcomes.

"The severe weather events we have mapped should not be seen as certainties, but they are credible," said the lead researcher who oversaw the research. "Britain has been formulating policy without the tools to assess worst-case scenarios. We've now given decision-makers what they need to get ready for future conditions they pray never occur, but dare not dismiss."

A Spectrum of Harsh Climate Scenarios

Another collection of severe models sets out the possible scale of extreme weather between now and the year 2100. These show that temperatures could rocket in certain periods by up to 6C higher than historical levels, while precipitation could be triple standard measurements.

The probability of the worst-case outcomes happening cannot be precisely determined due to uncertainty about what steps will be taken to tackle global warming and how the climate system will behave. This approach was described as similar to defence planning or scenario planning for the banking sector.

Critical Possibility Elements

• 4C Temperature Rise: Planetary heating rising well above 4C by 2100 could happen if emissions cuts collapses or if powerful amplifying effects including the Amazon rainforest perishing unleash its enormous store of carbon. This would result in intense and enduring heat domes and droughts hitting the UK in summer.
• Ocean Circulation Failure: A critical sea current, the Atlantic meridional overturning circulation (Amoc), is weakening and becoming unstable due to climate change. A collapse starting around 2030 would lead to a six-degree temperature drop in the UK. "Agriculture would face immense difficulties and water supplies would be completely altered," explained the professor.
• Sudden Ocean Inundation: A surge of 2.0-2.2 metres around the UK by 2100 could happen if glaciers in the polar regions disintegrate quickly, submerging low-lying areas. Unlike the other scenarios, this possibility is already known by infrastructure experts.
• Aerosol Effect: Temperatures could also be driven up by about 0.75C if airborne particulates is rapidly cleaned up. This unexpected result occurs because pollution particles from industrial activity block sunlight from reaching the ground.

Building Resilience Against the Unthinkable

These dire projections could be used to inform the development of major projects, including housing developments, power generation facilities and water management networks. Understanding these future hazards could also accelerate the drive to slash greenhouse gas emissions.

The analysis created the severe projections using a mix of observed and historical experience, climate models and established principles. The scenarios do not take into account broader worldwide issues like the global food shortages and increased conflict.

This work was initiated as part of a national risk assessment framework. Earlier reports have cautioned that not enough attention was being given to catastrophic yet improbable risks.

An independent advisory body has stated that the UK needs to "adapt to 2C" and evaluate the threats for four degrees. Earlier government strategies have been criticised as being "insufficient" by environmental groups.

An official statement said: "Climate change is at the heart of the country's focus, both building resilience and becoming a low-carbon economy. It is crucial that the UK is resilient for the impacts."