Simulations of ocean sound based on pre-whaling whale population levels suggest that the ocean may have been even louder than today caused by all the singing whales. Current noise levels are high and rising due to anthropogenic sound, mainly shipping, which is thought to drown out whale sounds.
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http://www.sciencedaily.com/releases/2012/10/121023123954.htm?utm_source=feedburner&utm_medium=email&utm_campaign=Feed%3A+sciencedaily%2Fplants_animals%2Fdolphins_and_whales+%28ScienceDaily%3A+Plants+%26+Animals+News+--+Dolphins+and+Whales%29
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