Models have predicted for some time that with every degree of global warming, the Arctic will see double or more.
The wet and low-lying East Siberian Arctic is likely to be a major methane source in the coming decades.
Polar regions may be becoming more profitable, but these "benefits" come with far more severe costs.
Life-threatening cold temperatures in the central US are caused by changes in wind circulation in the Arctic that bring cold air south. Climate change could make these events more frequent.
Extreme climatic events are harming plant communities in the Arctic. The resulting colour change is bad news for the region's carbon storage.
But it's too early to tell whether climate change is to blame.