Wind farms tend to be located in paddocks where pretty much no one lives aside from a few cows. They are less noisy than a lawnmower.
Jet aircraft are a shitload noisier than lawnmowers. Sydney's second airport will be located in the middle of a city where millions of people live and is planned to operate 24 hours.
Why the fuck is Tony Abbott so worried about cows and so unconcerned about people?