Human noise drowns out song of whales

ROME – The songs that whales and dolphins use to communicate, orient themselves and find mates are being drowned out by human-made noises in the world's oceans, U.N. officials and environmental groups said Wednesday.
That sound pollution — everything from increasing commercial shipping and seismic surveys to a new generation of military sonar — is not only confounding the mammals, it also is further threatening the survival of these endangered animals.