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The German icebreaker and research vessel Polarstern at shore in Tromso, Norway, Wednesday Sept. 19, 2019. Scientists from more than a dozen nations are preparing to launch the biggest and most complex research expedition ever attempted in the central Arctic. About 100 researchers will set sail Friday from Tromso, Norway, aboard the German icebreaker Polarstern in an effort to understand how climate change is affecting the Arctic and regions beyond. (Rune Stoltz Bertinussen/NTB Scanpix via AP)

The German icebreaker and research vessel Polarstern at shore in Tromso, Norway, Wednesday Sept. 19, 2019. Scientists from more than a dozen nations are preparing to launch the biggest and most complex research expedition ever attempted in the central Arctic. About 100 researchers will set sail Friday from Tromso, Norway, aboard the German icebreaker Polarstern in an effort to understand how climate change is affecting the Arctic and regions beyond. (Rune Stoltz Bertinussen/NTB Scanpix via AP)

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