2,000: distance in kilometers greater than which cetaceans can communicate
63: percent of protected natural spaces where human activity doubles background-noise levels
21: percent of protected natural spaces where human activity increases background-noise levels tenfold
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¹Footnotes
Cetaceans: [theconversation.com](https://theconversation.com/the-ocean-is-not-a-quiet-place-184543). Protected: [theatlantic.com](https://www.theatlantic.com/magazine/archive/2022/07/light-noise-pollution-animal-sensory-impact/638446/)
*Originally published in the June 13, 2022, edition of the This Week in Sound email newsletter. Get it in your inbox via [tinyletter.com/disquiet](https://tinyletter.com/disquiet).*