AP Photo

Two months ago, I found myself standing at a busy road junction in Ghana's capital, Accra. Surrounded on all sides by cars, taxis, lorries, and loudspeakers blasting out advertising slogans, I could barely hear myself think. It's certainly hard to dispute that the world is getting noisier. More traffic, more machinery, more people, more of everything - all producing a rising arc of cacophony. The question is, what do we do about it?