A dire warning has been issued by a United Nations (UN) expert regarding the increasing intensity and duration of year-round heatwaves, a consequence of climate change. As Europe and other regions face extreme temperatures, John Nairn, a senior extreme heat advisor at the UN’s World Meteorological Organization (WMO), stressed that heatwaves are becoming more frequent and starting earlier in certain areas.
Recent weeks have seen headlines dominated by extreme heat events, including the ongoing “heat dome” affecting Europe, heat-fueled wildfires in countries like Greece, Spain, Canada, and Hawaii, and unseasonably high temperatures during South American winter.
Nairn highlighted in an interview with AFP that the acceleration of heatwaves starting sooner, lasting longer, and intensifying represents one of the most rapidly emerging consequences of global warming. He urged against underestimating the significance of this trend and emphasized that it aligns with scientific predictions.
The weakening of global jet streams, high-altitude air currents, is contributing to the intensification of heatwaves. As these jet streams slow down and become more erratic, weather systems tend to stall in one location for extended periods. This phenomenon can result in prolonged heatwaves, according to Nairn’s explanation.
The altered weather patterns are causing heatwaves to appear across various parts of the world simultaneously. Nairn pointed out that North America, sections of the Atlantic Ocean, Europe, and Asia are concurrently experiencing these heatwave conditions due to the modified jet streams.
Heatwaves present a grave threat as one of the deadliest natural hazards, causing countless preventable heat-related deaths annually. Nairn stressed the need to shift the dialogue around heatwaves to a more comprehensive and informed discourse. He advocated for heightened attention on increasing minimum overnight temperatures, as these have a more profound impact on human health compared to peak daytime temperatures.
Nairn emphasized that escalating minimum temperatures have an accumulative effect, channeling surplus energy into prolonged periods of heightened temperatures. As the climate crisis continues to unfold, he cautioned that the situation will deteriorate further, particularly in tropical and subtropical regions. Nairn expressed concern over the emergence of severe and extreme heatwaves throughout the year, even during traditionally cooler seasons.
To combat the intensifying heatwaves and address the climate crisis, Nairn underscored the urgency of transitioning away from fossil fuels and electrifying various facets of society. He called upon individuals and communities to collectively take action to reverse this trend and mitigate the impacts of rising temperatures.
