Noise or CO2

Every major decision is a compromise; in the sense you need to select one thing and forgo another.

A good example is the recent Qantas decision:

The airline yesterday announced it would cease its trial of flying over the north Queensland city from Monday, bowing to pressure from residents concerned about the increase in aircraft noise.
[…]
“The most fuel-efficient flight path may decrease carbon dioxide emissions but increase the number of people exposed to aircraft noise, as has been the case in Cairns.

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