According the Intergovernmental Panel on Climate Change (IPCC), average temperatures are increasing at twice the rate in the arctic as they are in the rest of the world. For the national park units in the Arctic Network, including Bering Land Bridge National Preserve, it is predicted that the temperature may rise 10o F in less than 70 years. Warmer winters, more rain, and decreased evaporation rates, will result in drastic effects on the region's landscapes and waterways. On the shoreline, these effects can be observed in the coastal erosion that is occurring more rapidly than normal, due to the thawing and collapsing of once-frozen sediments, in some areas displacing entire villages.
Further out in the northern oceans, sea ice is forming later each season and melting earlier. This directly leads to a reduction of albedo, which is the proportion of sunlight reflected off a surface (in this case, ice). To better understand albedo, first imagine wearing a black T-shirt on a hot, sunny day. The dark color absorbs the heat, making the fabric feel hot on your skin. If you were to wear a white T-shirt instead, the light color would reflect the sunlight away and you'd feel much cooler.