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The direst projected effects of the climate emergency for the UK have been outlined by researchers, including a blistering 4C rise in average temperatures to a two-metre increase in sea levels. A separate possibility foresees a decline of 6C in temperature following the shutdown of crucial Atlantic Ocean currents, which would severely impact agriculture and power requirements.

Plausible Extremes, Not Guarantees

These consequences, certain ones are associated with climate tipping points, are considered as improbable but possible. The team stated that these scenarios plugged a hole in risk assessment that had left the UK not ready for extreme outcomes.

"The worst-case scenarios we have detailed are not forecasts, but they are possible," said the professor who led the study. "Britain has been formulating policy without the frameworks to plan for catastrophic outcomes. We've now provided decision-makers what they need to prepare for climate outcomes they hope never happen, but must not overlook."

A Range of Severe Conditions Scenarios

Another collection of severe models details the potential extent of extreme weather between now and the close of the 2100s. These suggest that thermometer readings could skyrocket in particular seasons by up to 6C higher than average, while precipitation could be 300% of typical amounts.

The likelihood of the extreme scenarios happening cannot be precisely determined due to unknown factors about what action will be enacted to combat global heating and how the Earth's systems will respond. This approach was likened to national security risk assessments or stress tests for the banking sector.

Major Possibility Details

• Severe Heating: Planetary heating rising well above 4C by 2100 could transpire if climate action collapses or if vicious cycles like the tropical forests becoming a net carbon source release its huge repository of carbon. This would cause intense and enduring heat domes and dry spells plaguing the UK in summer.
• Ocean Circulation Failure: A major ocean current, the Atlantic meridional overturning circulation (Amoc), is losing strength and losing stability due to ocean warming. A collapse beginning in 2030 would lead to a 6C cooling in the UK. "Agriculture would face immense difficulties and water resources would be completely altered," said the lead researcher.
• Sudden Ocean Inundation: A increase of 2.0-2.2 metres around the UK by 2100 could happen if polar ice in the Arctic and Antarctic disintegrate quickly, flooding seaside communities. Unlike the other scenarios, this possibility is already understood by planners.
• Aerosol Effect: Global averages could also be pushed higher by about 0.75C if industrial aerosols is sharply cut. This unexpected result occurs because aerosol particles from fossil fuel combustion block sunlight from reaching the ground.

Building Resilience Against the Worst

The worst-case scenarios could be applied to guide the building of major projects, for example housing developments, nuclear power stations and flood defences. Awareness of these environmental threats could also speed the transition to reduce carbon pollution.

The analysis created the worst-case scenarios using a combination of past data and records, digital projections and scientific theory. These outcomes exclude international cascading effects like the devastation of food supplies and geopolitical instability.

The project was commissioned as part of a national risk assessment framework. Earlier reports have stated that insufficient focus was being allocated to high-consequence, low-probability risks.

Official experts has recommended that the UK needs to "prepare for two degrees of warming" and assess the threats for four degrees. Past policy documents have been labeled being "inadequate" by some observers.

A government spokesperson noted: "Climate change is at the heart of our national priorities, both preparing for impacts and transitioning to a low-carbon economy. It is vital that the UK is prepared for the consequences."