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Call to Earth 147 videos
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SELKIRK, UNITED KINGDOM - OCTOBER 31: Salmon attempt to leap up the fish ladder in the river Etterick on October 31, 2012 in Selkirk, Scotland. The salmon are returning upstream from the sea where they have spent between two and four winters feeding with many covering huge distances to return to the fresh waters to spawn. (Photo by Jeff J Mitchell/Getty Images)
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Two women are enduring their second Arctic winter to highlight climate change
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