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TO GO WITH AFP STORY BY CELINE SERRAT A scientist carrying a rifle rides a bicycle on July 21, 2015 in a street of the scientific base of Ny Alesund in the Svalbard archipelago. The research centre, formerly a coal mining town, is perched on the Norwegian island of Spitsbergen, which is also home to a sizeable polar bear community in one of the most extreme landscapes on Earth. Svalbard is roughly one-and-a-half times the size of Switzerland, and home to some 3,000 polar bears -- outnumbering the 2,500-odd human inhabitants. AFP PHOTO / DOMINIQUE FAGET (Photo credit should read DOMINIQUE FAGET/AFP via Getty Images)

TO GO WITH AFP STORY BY CELINE SERRAT
A scientist carrying a rifle rides a bicycle on July 21, 2015 in a street of the scientific base of Ny Alesund in the Svalbard archipelago. The research centre, formerly a coal mining town, is perched on the Norwegian island of Spitsbergen, which is also home to a sizeable polar bear community in one of the most extreme landscapes on Earth. Svalbard is roughly one-and-a-half times the size of Switzerland, and home to some 3,000 polar bears -- outnumbering the 2,500-odd human inhabitants. AFP PHOTO / DOMINIQUE FAGET        (Photo credit should read DOMINIQUE FAGET/AFP via Getty Images)