It has been unseasonably warm here in Beringia so far this winter, with temperatures up into the 20s and even 30s—above zero! It has also been unseasonably dry, with very little snow so far. It makes you wonder about climate change and how it might affect us at a local level.
While I was out splitting wood, my mind was wandering, as usual, and I remembered that polar bears diverged from brown bears a long time ago, and that polar bears had survived through the last interglacial period, which was warmer than this one (so far). In refreshing my memory, I (re)learned that polar bears split off from brown bears about 600,000 years ago and actually survived through multple interglacials. The last interglacial (we’re in one now, the Holocene), was called the Sangamon interglacial or the Eemian. It was about 130,000-115-000 years ago and was perhaps the warmest of the interglacial cycles experienced by polar bears. That interglacial period was warmer than today, and it is considered that the polar ice caps melted—the Arctic Ocean probably only had ice in the winter.
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