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Land areas are not the only places getting busier. Increasingly, the oceans are being polluted by shipping traffic noise, especially up and down the U.S. eastern and western seaboards. The cacophony interferes with the ability of whales and other sea animals to hear each other; they rely on quiet waters to communicate many miles apart.
Christopher Clark, the I.P. Johnson Director of the Bioacoustics Research Program at the Cornell Lab of Ornithology, discusses his state-of-the-art acoustic technology and the difficulties facing whales.