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A polar bear and her cub come close to equipment placed by scientists from Polarstern, a ship that is part of a scientific expedition investigating the consequences of Arctic climate change, in the central Arctic Ocean, on 10 October, 2019. (Esther Horvath, for The New York Times) NO SALES, THIS MATERIAL IS FOR SINGLE USE PUBLICATIONS IN PRINT OR FOR A TEMPORARY ONLINE PUBLICATION, AND MAY BE USED EXCLUSIVELY TO PUBLICIZE THE 2020 WORLD PRESS CONTEST AND EXHIBITION. IT MAY NOT BE PUBLISHED AS PART OF AN ARTICLE OR ANY OTHER ITEM THAT CONTAINS NO DIRECT LINK TO WORLD PRESS PHOTO AND ITS ACTIVITIES. THE PICTURE MAY NOT BE CROPPED OR MANIPULATED IN ANY WAY. KEYSTONE PROVIDES ACCESS TO THIS PUBLICLY DISTRIBUTED HANDOUT PHOTO. THE COPYRIGHT IS OWNED BY A THIRD PARTY.