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全球暖化情况逐渐恶化，南极出现单日破20度高温，北极气温也上升。冰层融化、下降，使得北极熊无法在正常的情况下捕猎，导致它们开始出现自相残杀的情况，甚至捕食幼子。

在过去25年来，北极冰层至少降低40%，研究人员依利雅表示，由于食物供应短缺，因此导致北极熊自相残杀的案例增加，“这种情况以前很少见，但现在却经常发生。”

依利雅还说到，在食物短缺的情况下，大型雄性北极熊会攻击母熊和幼子，尤其是母熊在喂食幼子的时候。