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The gravest potential impacts of the climate emergency for the UK have been detailed by researchers, including a scorching 4C increase in temperatures to a two-metre surge in ocean levels. An alternative projection foresees a drop of 6C in temperatures following the shutdown of critical Atlantic Ocean currents, which would severely impact agriculture and energy demand.

Plausible Outcomes, Not Guarantees

These impacts, certain ones are associated with critical climate thresholds, are considered as improbable but credible. The researchers said that these projections plugged a hole in risk assessment that had rendered the UK ill-prepared for extreme outcomes.

"The climate extremes we have outlined should not be seen as certainties, but they are credible," stated the professor who directed the study. "The nation has been planning without the methods to plan for worst-case scenarios. We've now provided planners what they need to plan for environmental results they pray never occur, but dare not dismiss."

A Spectrum of Extreme Weather Scenarios

A further series of worst-case scenarios details the potential extent of extreme weather between now and the year 2100. These show that temperatures could rocket in some months by up to 6C above average, while rainfall could be three times typical amounts.

The chance of the extreme scenarios coming to pass cannot be precisely determined due to a lack of certainty about what action will be taken to address global warming and how the planet's climate will behave. This analysis was likened to security threat evaluations or stress tests for financial systems.

Major Outcome Highlights

• Four-Degree Warming: Planetary heating rising well above 4C by 2100 could occur if climate action collapses or if strong feedback loops such as the Amazon rainforest dying unleash its huge repository of carbon. This would cause intense and enduring heatwaves and water shortages affecting the UK in summer.
• Atlantic Current Collapse: A major ocean current, the North Atlantic current, is weakening and showing signs of collapse due to ocean warming. A full shutdown starting around 2030 would lead to a drastic cooling in the UK. "Crop production would struggle enormously and water supplies would be fundamentally reshaped," explained the professor.
• Rapid Sea Level Rise: A surge of 2.0-2.2 metres around the UK by 2100 could take place if ice sheets in Greenland and Antarctica disintegrate quickly, flooding low-lying areas. Differing from the other scenarios, this threat is already understood by infrastructure experts.
• Pollution Paradox: Global averages could also be pushed higher by about 0.75C if pollution from industry is drastically reduced. This unexpected result occurs because aerosol particles from industrial activity block solar radiation from reaching the ground.

Planning for the Worst

These dire projections could be utilized in planning the construction of critical national infrastructure, such as housing developments, power generation facilities and water management networks. Awareness of these environmental threats could also hasten the push to reduce greenhouse gas emissions.

The research formulated the severe projections using a mix of past data and records, digital projections and scientific theory. These outcomes exclude international cascading effects such as the agricultural collapse and resource wars.

The project was initiated as part of a official risk assessment framework. Previous assessments have cautioned that insufficient focus was being given to catastrophic yet improbable risks.

The government's climate advisors has recommended that the UK needs to "prepare for two degrees of warming" and evaluate the risks for four degrees. Earlier government strategies have been labeled being "very weak" by certain experts.

A government spokesperson noted: "Climate change is at the heart of this government’s agenda, both preparing for impacts and transitioning to a low-carbon economy. It is vital that the UK is resilient for the consequences."