Recently, many parts of the Northern Hemisphere have experienced unusually severe cold spells, prompting public questions about whether global warming is still ongoing. In fact, such extreme cold events do not contradict climate change; they may instead be a complex consequence of it. Scientists explain that rapid Arctic warming has destabilized the polar vortex—a large area of low pressure and cold air typically confined to the North Pole. Under normal conditions, the polar vortex traps frigid air in the Arctic. However, when it weakens or splits, massive amounts of cold air can surge southward, causing sharp temperature drops across mid-latitude regions in North America, Europe, and Asia. Additionally, La Niña events can intensify winter cold by altering global atmospheric circulation patterns. Therefore, short-term extreme cold episodes do not negate the long-term trend of global warming. On the contrary, an increasingly unstable climate system is leading to more frequent and intense extreme weather—whether heatwaves or deep freezes. Addressing climate change still requires global cooperation on emissions reduction and enhanced climate resilience.
近期北半球多地遭遇罕见寒潮，引发公众对‘全球变暖是否仍在持续’的疑问。实际上，这种极端寒冷天气并不与气候变化相矛盾，反而可能是其复杂影响的一部分。科学家指出，北极地区快速变暖导致极地涡旋（Polar Vortex）变得不稳定。正常情况下，极地涡旋将冷空气牢牢锁在北极；但当其减弱或分裂时，大量冷空气便南下侵袭中纬度地区，造成北美、欧洲和亚洲部分地区出现剧烈降温。此外，拉尼娜现象也可能加剧冬季寒冷，通过改变大气环流模式影响全球天气。因此，短期的极端低温事件不能否定长期的全球变暖趋势。相反，气候系统日益不稳定，使得极端天气——无论是酷热还是严寒——发生的频率和强度都在增加。应对气候变化，仍需全球协同减排与加强气候适应能力。
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