Computer simulations suggest that the Bering Strait, the open water separating North America and Russia, might be serving as a global temperature stabilizer. Likewise, when there is (was) no open water (i.e. Bering Land Bridge), global climate is less stable.

http://news.sciencemag.org/sciencenow/2012/04/land-bridge-caused-wild-temperature.html?ref=em

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