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The direst possible consequences of the climate emergency for the UK have been mapped by researchers, encompassing a scorching 4C increase in average temperatures to a 2-metre increase in sea levels. An alternative projection predicts a decline of 6C in temperature following the shutdown of crucial Atlantic Ocean currents, which would profoundly upset food production and power requirements.

Credible Events, Not Predictions

These effects, a number of which are associated with critical climate thresholds, are viewed as unlikely but credible. The team stated that these scenarios filled a gap in planning that had left the UK not ready for catastrophic possibilities.

"The climate extremes we have detailed aren’t predictions, but they are credible," said Nigel Arnell who oversaw the study. "The nation has been planning lacking the tools to test against worst-case scenarios. We've now provided policymakers what they need to get ready for environmental results they wish to avoid, but must not overlook."

A Suite of Harsh Climate Possibilities

A further series of severe models sets out the possible scale of extreme weather between now and the year 2100. These indicate that temperatures could skyrocket in particular seasons by up to 6C above the norm, while precipitation could be three times standard measurements.

The chance of the catastrophic events occurring cannot be precisely determined due to a lack of certainty about what steps will be taken to combat global heating and how the climate system will behave. This analysis was compared to security threat evaluations or stress tests for economic stability.

Key Possibility Elements

• Severe Heating: Global temperatures rising well above 4C by 2100 could transpire if climate action breaks down or if powerful amplifying effects including the Amazon rainforest becoming a net carbon source release its enormous store of carbon. This would cause severe and lengthy heatwaves and water shortages hitting the UK in summer.
• Atlantic Current Collapse: A critical sea current, the AMOC, is slowing down and losing stability due to global heating. A full shutdown starting around 2030 would lead to a drastic cooling in the UK. "Farming would face immense difficulties and water supplies would be drastically changed," noted Arnell.
• Rapid Sea Level Rise: A rise of 2.0-2.2 metres around the UK by 2100 could occur if glaciers in Greenland and Antarctica disintegrate quickly, inundating coastal cities and towns. Differing from the other scenarios, this possibility is already understood by infrastructure experts.
• Pollution Paradox: Temperatures could also be pushed higher by about 0.75C if pollution from industry is rapidly cleaned up. This unexpected result occurs because aerosol particles from fossil fuel combustion block solar radiation from warming the ground.

Planning for the Extreme

The severe models could be used to inform the construction of critical national infrastructure, for example housing developments, power generation facilities and flood defences. Awareness of these environmental threats could also hasten the transition to slash greenhouse gas emissions.

The study formulated the worst-case scenarios using a mix of past data and records, computer simulations and established principles. The possibilities do not take into account international cascading effects like the global food shortages 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 allocated to low‐likelihood but high‐impact risks.

Official experts has said that the UK must "adapt to 2C" and assess the threats for four degrees. Previous adaptation plans have been labeled being "inadequate" by certain experts.

An official statement noted: "The climate emergency is at the heart of the country's focus, both building resilience and establishing itself as a renewable energy leader. It is vital that the UK is resilient for the effects."