Earth Hour - I will if you will

Saturday is Earth Hour - now celebrated by over 7000 cities in over 150 countries - each turning off there lights for one hour at 8.30pm.

Here in Australia the theme is "lights out for the reef", recognising the damage climate change can do to one of Australia's most enjoyable destinations. There will be a special Great Barrier Reef documentary on Channel 10 at 4.30pm, in the lead up to Earth Hour at 8.30pm.

You can host your own event, or attend one of the public gatherings. To do a bit more, visit the I will if you will site to accept the challenge of someone else - or to create your own.

If you're outside Australia, check Earth Hour around the world for your local Earth Hour site and information.