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Noise pollution hurts wildlife, but states have trouble turning down the volume


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A low rumble thrums through the deck as Tacoma, a 5,000-ton ferry, makes its run across Puget Sound from Seattle to Bainbridge Island. Standing near the railing, Colin McCann, a legislative analyst for Washington State Ferries, points to the water where the agency recently dropped a microphone 500 feet below the surface as part of a study to capture the acoustic profile of every vessel in the state's fleet.

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