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In this Wednesday, Nov. 27, 2019 file photo, different layers of snow on the top of Longastunturi mountain outside Kiruna, Sweden. A collaboration between reindeer herders and scientists is attempting to shed light on dramatic weather changes and develop tools to better predict weather events and their impacts. Unusual weather patterns in Sweden’s arctic region seem to be jeopardising the migrating animals’ traditional grazing grounds, as rainfall during the winter has led to thick layers of snowy ice that block access to food. (AP Photo/Malin Moberg)