FILE PHOTO: Sergey Zimov, a scientist who works at Russia’s

FILE PHOTO: Sergey Zimov, 66, a scientist who works at Russia’s Northeast Science Station, holds an ice crystal in the underground area where sample materials are stored in permafrost at the Pleistocene Park outside of the town of Chersky, Sakha (Yakutia) Republic, Russia, September 13, 2021. REUTERS/Maxim Shemetov/File Photo