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The direst possible consequences of the climate emergency for the UK have been outlined by researchers, ranging from a searing 4C jump in temperatures to a two-metre rise in sea level. A separate possibility envisions a plunge of 6C in temperatures following the collapse of crucial Atlantic Ocean currents, which would profoundly upset farming and energy demand.

Plausible Outcomes, Not Forecasts

These effects, certain ones are connected to critical climate thresholds, are considered as low probability but possible. The team explained that these scenarios filled a gap in forecasting that had rendered the UK not ready 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 led the research. "Britain has been planning lacking the frameworks to test against catastrophic outcomes. We've now given decision-makers what they need to get ready for climate outcomes they pray never occur, but can’t afford to ignore."

A Suite of Severe Conditions Scenarios

A second set of dire projections details the potential extent of extreme weather between now and the close of the 2100s. These indicate that thermometer readings could soar in some months by up to 6C higher than average, while rainfall could be 300% of typical amounts.

The probability of the catastrophic events happening could not be calculated due to uncertainty about what action will be taken to tackle global warming and how the climate system will react. This approach was compared to security threat evaluations or resilience checks for economic stability.

Key Outcome Details

• 4C Temperature Rise: Planetary heating soaring past 4C by 2100 could happen if emissions cuts collapses or if vicious cycles like the Amazon basin dying unleash its vast reserves of carbon. This would cause severe and lengthy heat domes and droughts affecting the UK in summer.
• Atlantic Current Collapse: A critical sea current, the Atlantic meridional overturning circulation (Amoc), is losing strength and losing stability due to climate change. A full shutdown beginning in 2030 would lead to a drastic cooling in the UK. "Crop production would face immense difficulties and water supplies would be drastically changed," noted the professor.
• Sudden Ocean Inundation: A rise of 2.0-2.2 metres around the UK by 2100 could happen if glaciers in Greenland and Antarctica melt abruptly, submerging seaside communities. Differing from the other scenarios, this risk is already recognized by coastal engineers.
• Aerosol Effect: Global averages could also be pushed higher by about 0.75C if airborne particulates is sharply cut. This paradoxical outcome occurs because tiny specks from burning coal scatter sunlight from reaching the ground.

Planning for the Worst

The severe models could be used to inform the building of critical national infrastructure, including expanded cities, power generation facilities and flood defences. Knowledge about these environmental threats could also hasten the transition to reduce fossil fuel emissions.

The study formulated the worst-case scenarios using a blend of observed and historical experience, computer simulations and scientific theory. The possibilities do not take into account potential global problems including the devastation of food supplies and resource wars.

The project was requested as part of a government’s adaptation planning initiative. Previous assessments have warned that not enough attention was being given to high-consequence, low-probability risks.

Official experts has stated that the UK needs to "prepare for two degrees of warming" and examine the dangers for four degrees. Past policy documents have been labeled being "inadequate" by certain experts.

A government spokesperson said: "The climate emergency is at the center of this government’s agenda, both preparing for impacts and becoming a renewable energy leader. It is essential that the UK is resilient for the effects."