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From left: Lei Wang and Jungang Dong of the Chinese Academy of Sciences in Xi’an, China, take a sample from an ancient southern Chinese pine tree on Mt. Helan in the western Loess Plateau of China. (Photo: ©2017 Yu Liu, The Institute of Earth Environment, Chinese Academy of Sciences) From left: Lei Wang and Jungang Dong of the Chinese Academy of Sciences in Xi’an, China, take a sample from an ancient southern Chinese pine tree on Mt. Helan in the western Loess Plateau of China.