Oceans, the “sleeping giants” of climate change: 1.7 million Britons at risk of flooding

Brussels – The planet’s oceans and glaciers possess an extremely long memory and immense inertia. They respond slowly to global warming, but once set in motion, halting them becomes a task that spans generations. This is why scientists describe rising sea levels as the “sleeping giant” of climate change: a silent threat which, even in the best-case scenario, will continue to reshape our coastlines for centuries to come. Quantifying the scale of this challenge with unprecedented precision is a pioneering study published in the Nature Communications journal. Carried out by researchers at the Met Office and the University of Bristol, in collaboration with the specialist firm Fathom, the study analyses, for the first time, the direct impact of rising sea levels on the UK population, projecting it along a timeline extending into the 23rd century. 

The figures paint a picture of an inevitable geographical and demographic transformation, highlighting the urgent need for structural adaptation strategies. According to the study’s estimates, by the end of this century the sea level along the British coastline will have risen by between 0.4 and 0.6 metres. This may appear to be a modest change, but it is sufficient to increase the area classified as at risk of flooding by 13 per cent. Put in human terms: by the start of the next century, at least half a million more people in the UK will be exposed to the risk of coastal flooding, marking a 25 per cent increase on current levels. But the impact does not stop in 2100. Even if global policies manage to meet the most stringent emission reduction targets set by the Paris Agreement, the effect of heat accumulation in the oceans will continue to push the water levels upwards: by 2200, around 1.4 million more people will be at risk of coastal flooding; by 2300, this figure will rise to 1.7 million people, with sea levels set to triple compared with the end of this century (+1.2 / +1.8 metres) and a 56 per cent increase in the areas at risk. 

To arrive at these findings, the research team cross-referenced data provided by the IPCC (the United Nations Intergovernmental Panel on Climate Change) with a very high-resolution hydrodynamic model developed by Fathom. The low-lying areas of the British east coast naturally top the list of the most vulnerable regions. In particular, the large Wash estuary and the Humber estuary are identified by scientists as true hotspots for future hydrogeological risk. The implications of this research go far beyond mere scientific speculation and highlight the need to radically rethink urban planning and coastal infrastructure. While emissions reduction remains the first line of defence against the most dramatic scenarios, policymakers must recognise that a portion of this rise is now “written into” the physics of the planet.

* In collaboration with GEA News Agency