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The gravest possible consequences of the global heating for the UK have been outlined by scientists, including a scorching 4C rise in mean temperatures to a 2-metre surge in sea level. Another scenario predicts a decline of 6C in temperature following the collapse of critical Atlantic Ocean currents, which would massively disrupt food production and energy demand.

Plausible Outcomes, Not Guarantees

These consequences, some of which are linked to climate tipping points, are viewed as unlikely but possible. The scientists said that these projections plugged a hole in planning that had rendered the UK unprepared for worst-case results.

"The climate extremes we have detailed are not forecasts, but they are plausible," stated the professor who led the study. "The nation has been formulating policy in the absence of the tools to assess worst-case scenarios. We've now provided planners what they need to plan for climate outcomes they pray never occur, but dare not dismiss."

A Spectrum of Harsh Climate Projections

Another collection of worst-case scenarios sets out the projected severity of severe conditions between now and the close of the 2100s. These indicate that temperatures could soar in certain periods by up to 6C above the norm, while rainfall could be triple standard measurements.

The likelihood of the worst-case outcomes happening cannot be precisely determined due to a lack of certainty about what steps will be taken to tackle global heating and how the climate system will respond. This analysis was likened to national security risk assessments or scenario planning for financial systems.

Major Possibility Details

• Four-Degree Warming: Worldwide averages soaring past 4C by 2100 could transpire if emissions cuts breaks down or if strong feedback loops like the tropical forests dying release its enormous store of carbon. This would cause severe and lengthy heat domes and water shortages hitting the UK in summer.
• Atlantic Current Collapse: A critical sea current, the Atlantic meridional overturning circulation (Amoc), is losing strength and showing signs of collapse due to global heating. A collapse commencing by 2030 would lead to a drastic cooling in the UK. "Farming would face immense difficulties and water supplies would be fundamentally reshaped," said the professor.
• Sudden Ocean Inundation: A rise of 2.0-2.2 metres around the UK by 2100 could happen if ice sheets in the polar regions disintegrate quickly, flooding low-lying areas. Unlike the other scenarios, this risk is already understood by infrastructure experts.
• Clean Air Warming: Global averages could also be increased by about 0.75C if industrial aerosols is drastically reduced. This unexpected result occurs because pollution particles from burning coal block sunlight from warming the ground.

Preparing for the Extreme

The severe models could be utilized in planning the construction of critical national infrastructure, including expanded cities, power generation facilities and urban drainage systems. Awareness of these future hazards could also hasten the drive to reduce fossil fuel emissions.

The research formulated the extreme models using a blend of observed and historical experience, climate models and climate physics. The possibilities exclude international cascading effects such as the agricultural collapse and increased conflict.

This work was commissioned as part of a national climate resilience programme. Previous assessments have cautioned that insufficient focus was being paid to high-consequence, low-probability risks.

Official experts has recommended that the UK needs to "adapt to 2C" and assess the risks for severe warming. Earlier government strategies have been criticised as being "inadequate" by environmental groups.

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