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An aerial view of a propelled airplane passing by the mountains of the Nordre Isfjorden national park near Ny-Ålesund on the island of Spitsbergen, Norway, 8 April 2015. The island accommodates various arctic research centres which examine and conduct scientific research into climate and atmospheric research, oceanography, marine geology and ice and glacier physics. Photo: Jens Buettner/dpa | usage worldwide (KEYSTONE/DPA/Jens Büttner)