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noise pollution

Cars line up at the south entrance to Zion National Park in Utah, bringing with them the urban soundscape. Education Images/UIG via Getty Images hide caption

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Education Images/UIG via Getty Images

America's Protected Natural Areas Are Polluted, By Noise

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Traffic is a major source of noise pollution in Delhi (above) and other Indian cities. Daniel Berehulak/Getty Images hide caption

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Daniel Berehulak/Getty Images

Click Here For A Sample Of Delhi Street Noise

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A brown bear in its natural habitat. Wildlife ecologists in Minnesota found that black bears in their study experienced an increase in heart rate when buzzed by drones. iStockphoto hide caption

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iStockphoto

Drones Increase Heart Rates Of Wild Bears. Too Much Stress?

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Humpback whales and tanker in Stellwagen Bank National Marine Sanctuary in Massachusetts Bay. Green Fire Productions/Flickr hide caption

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Green Fire Productions/Flickr

Listening To Whale Migration Reveals A Sea Of Noise Pollution, Too

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