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过去，北极海冰很少融化，但是现在，随着北极气温上升，每年有大量多年冰融化到海洋中。这完全打破了多年冰与季节性冰的储量比率，使该地区及其生态系统处于危险之中。如海豹和北极熊，它们都不得不依靠覆盖着雪的厚厚海冰来筑巢和狩猎，而如今它们的栖息地却遭到了毁灭性的破坏。参考文献：Arctic sea ice thickness, volume, and multiyear ice coverage: losses and coupled variability (1958–2018), Environmental Research Letters, Volume 13, Number 10.
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