The Sydney Opera House management has tried to quell the rumblings by putting up sound deflectors in the ceilings but the orchestra say they just look like toilet seats and don't help at all.

BBC: Sydney's opera rebellion

Other techniques aim to enhance marine cloud reflectivity by introducing sea salt aerosols in low clouds, mimic the effects of volcanic eruptions by injecting sulphate aerosols into the lower stratosphere, or place shields or deflectors in space to reduce the amount of incoming solar radiation.

FORBES: Green Groups Blast U.N. Climate Panel for Alarmism