Man-Made Noise
Bernie Krause listens to nature for a living. After having recorded nature for 40 years, he's noticing some alarming -- the natural sound of the world, biophony, is vanishing. Man-made noise is creeping into the most remote regions of Earth and Bernie argues that it's ruining our ecology. Animals divide up the acoustic spectrum so they don't interfere with one another's voices; no two species use the same frequency. So when man-made noise intrudes, certain species lose their ability to synchronize, communicate, and ultimately, survive.
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