Earth Hour Turns Spotlight on Emissions

Earth Hour may see people switch off their lights for just one hour on Saturday night, but organisers believe the environmental message will be everlasting.

The event, in which some of the world's major cities will be temporarily plunged into darkness, is hoped to spotlight the global need to reduce carbon emissions.

Organisers say the initiative, which started in Sydney last year, will be observed in 35 nations and across 370 cities, towns and councils worldwide.