I listened to the #GoldenStateNaturalist episode on listening in nature the other day and that got me to thinking about what Fil Corbitt, the guest on that episode, said about there being a plane overhead at least every 15 minutes and the sound pollution it causes.
After 9/11 I remember the silence. We went backpacking in the Cascades and it was so quiet like I never heard before and have never heard since.
https://www.goldenstatenaturalist.com/listening-in-nature-with-fil-corbitt/
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