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In the midst of five months of darkness this coming winter, the Norwegian town of Rjukan will have one bright spot: a town square illuminated by sunlight bounced off giant mirrors placed atop the town's neighboring mountains.

Read more: Giant Mirrors to Light Up One Dark Norwegian Town - Popular Mechanics

Economic modelling shows that the methane emissions caused by shrinking sea ice from just one area of the Arctic could come with a global price tag of 60 trillion dollars -- the size of the world economy in 2012.