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The call of the wild is getting harder to hear.Peaceful, natural sounds – bird songs, rushing rivers and rustling grass – are sometimes being drowned out by noise from people in many of America's protected parks and wilderness areas, a new study finds.Colorado State University biologist George Wittemyer said people hear only half the sounds that they would in natural silence.Except for city parks, though, the researchers are not talking about sound levels that people would consider unusually loud.The research team, which includes a special unit of the National Park Service, not only measured sounds across the U.S., but they also used elaborate computer programs and artificial learning systems to determine what sounds were natural and which were made by people.
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