QUOTE: "Here's a tree wall bordering my yard that absorbs sound."
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That borders a street/highway with moving traffic? Or your neighbors yard?
TEST
1. Get a decibel meter.
2. Take readings as cars, trucks, motorcycles pass on the city street.
3. Plant as many trees as you can.
4. Wait 10-?? years for trees to mature.
5. Take decibel reading.
6. Compare step 2 readings to step 5.
I'll await the results.
