This summer has recorded unprecedented heat across the Northern Hemisphere, with Europe experiencing its warmest June and July since records began. The contiguous United States also faced its hottest month ever recorded in July, while South Korea marked its highest temperature to date. As the summer heat lingers, scientists are already turning their gaze toward 2027, anticipating that the current El Niño phenomenon will have a more significant impact on next year’s temperatures than this summer.
Climate change, driven by the burning of fossil fuels and the consequent increase of greenhouse gases in the atmosphere, is intensifying heat waves globally. While each region experiences varying degrees of warming, Europe stands out as the fastest-warming continent, second only to the Arctic. A recent study highlighted that a heat wave in Europe this past May was significantly influenced by climate change, with temperatures approximately 3.5 °C (6.3 °F) higher than they would have been in 1976 under similar conditions. The United States, too, is grappling with extreme heat, breaking long-standing records from the Dust Bowl era.
Looking ahead, the current El Niño phenomenon is expected to exacerbate global temperatures. El Niño, a natural climate pattern characterized by periodic warming of ocean surface temperatures in the central and eastern Pacific, alters wind and rainfall patterns worldwide. The National Oceanic and Atmospheric Administration defines this phase as occurring when ocean temperatures exceed 0.5 °C above normal, leading to significant atmospheric changes. As the current El Niño develops, forecasts suggest it may peak at over 3.5 °C above average, possibly marking it as one of the strongest events recorded.
While El Niño itself does not add energy to the climate system, it redistributes existing heat stored in the oceans, which combined with the long-term effects of climate change, could lead to record-breaking temperatures. Notably, past El Niño events have shown that the most extreme temperature spikes often occur in the second year of the phenomenon. Given the severity of this summer’s heat, it is likely that next year could be even hotter. As the United Nations Secretary-General António Guterres remarked, “El Niño conditions will pour fuel on the fire of a warming world.” Consequently, it is crucial for individuals to consider preparations for the coming heat, such as investing in air conditioning, enhancing home insulation, or adopting renewable energy solutions. Long-term, addressing climate change through a transition away from fossil fuels is imperative for mitigating future heat extremes.
Source: What’s behind this summer’s heat, and why 2027 could be worse via MIT Technology Review