The Met Office has today issued a stark warning that an ‘extreme’ El Niño event is developing in the Pacific, with models suggesting this could amplify global temperatures beyond previous records. The assessment, based on high-resolution climate simulations from the Hadley Centre, indicates a 70% probability that sea-surface temperature anomalies in the Niño 3.4 region will exceed 2.0°C above the long-term average by late 2024.
This is not a routine fluctuation. The last comparable event, the 2015-16 El Niño, pushed global temperatures to 1.1°C above pre-industrial levels, contributing to coral bleaching, disrupted monsoon patterns, and record wildfires. But the baseline has shifted. Since then, human-caused greenhouse gas emissions have continued to accumulate, atmospheric carbon dioxide concentrations are now 20% higher, and the planet has absorbed additional heat equivalent to detonating several Hiroshima bombs per second.
Dr. Laura Thornton, a climate dynamics specialist at the University of Oxford, describes the scenario as “a dangerous superposition”. The natural variability of El Niño Southern Oscillation (ENSO) is riding on top of a long-term warming trend. “If this El Niño reaches the predicted intensity, we will likely see global average temperatures temporarily surpass 1.5°C above pre-industrial levels within the next 12 to 18 months,” she said. “That is not the Paris Agreement threshold permanently, but it is a clear sign we are accelerating towards it.”
The implications are profound. An extreme El Niño typically unleashes a cascade of climatic disruptions: drought in Southeast Asia and Australia, flooding along the South American coast, and altered jet streams that can bring more intense winter storms to parts of Europe. For the UK, the Met Office’s three-month outlook suggests a heightened risk of wetter-than-average conditions this autumn, though the exact pattern remains uncertain.
What is certain is the energy budget. The ocean has absorbed more than 90% of the excess heat from greenhouse gas forcing. A strong El Niño releases some of that stored heat into the atmosphere, acting like a temporary valve. But the atmosphere is already overloaded. Carbon dioxide concentrations are now 420 parts per million, levels not seen in at least 3 million years, when the planet was 2-3°C warmer and sea levels were 20 metres higher.
The urgency is not about panic; it is about physics. Every fraction of a degree matters. The difference between 1.5°C and 2°C of warming doubles the risk of heatwaves, reduces crop yields by 10-15%, and exposes hundreds of millions to water stress. This El Niño does not cause climate change; it reveals it. It strips away the illusion of stability.
We have the technological solutions: renewables, battery storage, efficiency, and emerging carbon removal technologies. What we lack is the political will to deploy them at scale. The science is clear. The data is unequivocal. The only question is whether we can act on it before the next record becomes the new normal.
