From Egypt's Tahrir Square to New York's Empire State Building, thousands of cities will turn off lights for 60 minutes from 8:30 pm local time, with switches flicked in around 150 countries and territories.
Newcomers to the Sydney-led initiative, now in its sixth year, include Libya, Iraq and the International Space Station, which will watch over the event as it rolls across the globe.
"There is no better way to raise awareness for the future of the most beautiful planet in the universe," said Andre Kuipers, an astronaut who will share photos and live commentary as he views Earth Hour from space.
Since it began in Sydney in 2007, Earth Hour has grown to become what environmental group WWF organisers say is the world's largest demonstration of support for action on carbon pollution.
A total of 5,251 cities took part in 2011, as the movement reached 1.8 billion people in 135 countries, they say.
"Earth Hour 2012 is a celebration of people power -- the world's largest mass environmental event in support of the planet," said chief executive of WWF-Australia Dermot O'Gorman.
"And we're seeing hundreds of millions of people in different countries around the world take actions to go beyond the hour in support of positive actions for climate change and the planet."
Sydney's Opera House and Harbour Bridge will be among the first landmarks to plunge into darkness from 0930 GMT, and will be followed by the likes of Tokyo Tower, Taipei 101 and the Great Wall of China.
In Singapore, 32 malls -- many located in the glittering Orchard Road shopping belt -- and more than 370 companies including luxury brands such as Louis Vuitton and Armani will turn off non-essential lighting.
In the Philippines, more than 1,780 police stations and training centres will turn off all non-essential lights and electrical equipment.
"We will turn off the lights in the offices but not the lights in the perimeter because our detainees might escape," said national police spokesman Superintendent Agrimero Cruz.
The movement then spreads across the planet, with buildings such as The Burj Khalifa, the Eiffel Tower and Louvre in Paris, the cupola of St Peter's Basilica in the Vatican and Buckingham Palace in London dimming their lights.
O'Gorman said about 40 percent of Australians participate in Earth Hour, which encourages people to switch off their lights for 60 minutes and think about energy usage, but the idea had also taken off globally.
Earth Hour co-founder Todd Sampson, chief executive of advertising firm Leo Burnett Sydney, said the event began as an initiative to get Sydneysiders to switch off the lights on the harbour foreshore.
"We never would have predicted that it would be as big as it is now. And it is even bigger overseas than it is locally," he said.
The movement has met with some criticism, but Sampson said this was a healthy part of the debate.
"It's not designed, and it would be foolhardy to believe, that switching a light switch is going to save the planet," he told reporters near the Sydney Harbour Bridge on Saturday.
"It was originally done to raise awareness, to get people to think about it and then take action in many different ways.
"I think scepticism is part of the debate. It moves everything forward." (AFP)
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