Stock Photo - 24 June 2019, Lower Saxony, Braunlage: Hikers walk through a spruce forest that died after a bark beetle infestation on the mountain Achtermann in the Harz Mountains. According to nature conservationists, the Borkenköfer accelerates the change from a spruce forest with few species to a primeval forest with more species in the Harz National Park. Photo: Swen Pförtner/dpa. - Braunlage/Lower Saxony/Germany

Stock Photo: 24 June 2019, Lower Saxony, Braunlage: Hikers walk through a spruce forest that died after a bark beetle infestation on the mountain Achtermann in the Harz.

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