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Wired has a feature that describes how man-made noise is drowning out the sounds of Earth’s ecology:
But Krause has noticed something alarming. The natural sound of the world is vanishing. He’ll be deep inside the Amazon, recording that cricket, but when he listens carefully he also hears machinery: The distant howl of a 747 or the dull roar of a Hummer miles way.
As the article notes, when background levels are very low (as is typical in very remote areas), transportation vehicles and industrial machinery can be audible even if the sources are located miles away.