Sydney was one of 7000 cities around the world plunged into darkness as lights were switched off for Earth Hour on Saturday night.
Peter Hannam Thousands of Sydneysiders will take part in the Earth Hour on Saturday evening, an event organisers hope will kick off a year-round campaign against climate change.
Authorities have recorded an estimated 3 per cent drop in energy use in Sydney's central business district during Earth Hour.
Photos from around the country.
Debra Jopson The lights went out around the globe like a Mexican wave in a football stadium at the weekend, as successive settlements observed Earth Hour.
Hundreds of landmarks from Berlin's Brandenburg Gate to the Great Wall of China went dark on Saturday night as part of a global effort to highlight climate change.
It's back - and bigger than ever. Tim Elliott reports on a global idea that was born in Sydney.
Tim Elliott The sea turtle, one of the earth's oldest creatures, is facing a battle for survival.
Peter Hannam The Great Barrier Reef will be irreversibly damaged by climate change in just 16 years, according to leading reef researcher Ove Hoegh-Guldberg.
Peter Hannam The lights go off - but Earth Hour organisers are urging participants to make a bigger switch.
Peter Hannam Convert 60 minutes of near darkness into a permanent shift in household energy use - that's the Australian goal of Earth Hour on Saturday.
The Loaded Dog
Earth Hour proved a truly explosive topic when we asked readers if they would join in the anti-global warming campaign.
Ben Cubby Earth Hour will take place on March 31, with the aim of attracting more than 1.3 billion people and becoming the biggest environmental event ever.
Ben Cubby The national green star rating system for office buildings is having one important side effect - those that are energy efficient are becoming much more valuable than those that are not.
Ben Cubby In a warehouse made from recycled straw, heated by solar panels and cooled by rainwater tanks, Claire Gordon patiently collects second-hand books about saving the world.
Ben Cubby Four days before Earth Hour takes place, the event has already surpassed records for the number of nations and cities taking part.
Green is, like, so hot right now, thanks to Australian model Miranda Kerr, who has been named Earth Hour's 'global ambassador'.
Paris Cowan The organisers of Earth Hour know it takes more than 60 minutes to reverse the impact of centuries of over-consumption on the environment.
We had become obsessed with our own small worlds and settled for pragmatic politics, writes David Humphries. But Earth Hour taps into a resurgent desire to tackle global crises.
Rachel Browne AS SYDNEY plunged into darkness last night, billions saw the light around the world. From Mumbai to Berlin, landmarks blended with the night sky, while friends and neighbours broke bread - and...