UK Coastal Flooding Threatens Millions Without Climate Action 2026

Millions of people in the UK face a long-term coastal flooding risk due to the climate crisis, scientists warn. Up to 13 million could be affected by the end of the century and beyond if emissions are not cut significantly. Even with today's pledges, about 1.4 million more people will be exposed by 2200.

The Growing Threat of Coastal Flooding in the UK

Sea level has risen by approximately 20cm around the UK in the last century, and the rate is accelerating. A further 40cm to 60cm rise by 2100 is already locked in, placing an additional half a million people at risk on top of the 2.5 million already living in vulnerable coastal areas. Regions like Lincolnshire and the Humber estuary are most in danger.

Sea Level Rise Projections

Scientists warn that gradual sea level rise could shift dramatically if ice sheets begin a runaway collapse. In a "reasonable worst-case scenario," the UK could see up to 15 metres of sea level rise by 2300, swamping large parts of London and other low-lying cities. This would necessitate large-scale movement of populations away from a dramatically reshaped coast.

Comparing Scenarios: Emissions Cuts vs. Business as Usual

The following table illustrates the projected number of people exposed to coastal flooding under different climate scenarios:

Keeping within the Paris agreement targets would cut the number of people exposed in 2300 by 1 million, highlighting the urgency of immediate climate action.

Key Takeaways

• 13 million people in the UK face long-term coastal flooding risk without major emission cuts.
• Sea level rise of up to 15 metres by 2300 is possible if ice sheet collapse accelerates.
• Investment in flood defences and managed retreat is inevitable.
• Even moderate warming locks in significant additional flood exposure.
• Immediate climate action can reduce the number of at-risk people by over a million.

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