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They say a picture is worth a thousand words, but sounds can tell the story of a million pictures.
Images of stranded polar bears, flooded Pacific islands, and shrinking glaciers are sharpening and clarifying the urgency of climate change.
Bernie Krause set out on a mission to record the sounds of a habitat that may soon disappear. He invented the field of "soundscape ecology" to tell the story of a changing planet—a symphony that's being silenced as sounds vanish from the wild.
A former musician with The Weavers with Pete Seeger, Krause has been recording the sounds of the wild since the 1960s. His recordings demonstrate just how rapidly a given landscape can change. His most recent book, "Voices of the Wild: Animal Songs, Human Din, and the Call to Save Natural Soundscapes," came out last month.