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For the last two decades, large-scale cooling trends have existed across large stretches of eastern North America and northern Eurasia. The authors of this journal article argue that this unforeseen trend is probably not due to internal variability alone. Instead, evidence suggests that summer and autumn warming trends are concurrent with increases in high-latitude moisture and an increase in Eurasian snow cover, which dynamically induces large-scale wintertime cooling. [Source: Environmental Research Letters]
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