Earth Hour is on again – tonight 28th March at 8.30pm. The event asks people and businesses to turn off lights and appliances for one hour. It ran for the first time in Sydney only a few years ago. Since then the idea has been picked up by many other major cities around the world.

But looking beyond all the hype, how useful is it really in helping to tackle the problem of climate change?

Last year I spoke with Andy Ridley, Executive Director of Earth Hour, to put him on the spot. Listen to the interview with Andy Ridley.

Check out their website. There’s heaps more information there – www.earthhour.org.