The lights will be switched off for an hour this evening at Portes des Bombes, the Mdina Bastions, St George's Square and the bastions in Victoria as Malta joins 126 nations in marking Earth Hour.

The purpose of the initiative is to raise awareness on energy conservation.

The lights will be switched off between 8.30 and 9.30 p.m.

Instead of electricity, the bastions at Victoria will be lit with torches.

Several hotels will also switch off the lighting of parts of their facades. They are also encouraging their guests to make a contribution to the 34U campaign, the Resources Ministry said.

The Earth Hour initiative was launched in Sydney three years ago. Some 6,000 cities now take part.

Tuvalu to Taiwan; landmarks switch off for Earth Hour

Landmarks such as Sydney's Opera House, Beijing's Forbidden City and Taiwan's Taipei 101 office tower temporarily went dark earlier today as nations dimmed the lights for Earth Hour 2010 to call for action on climate change.

The symbolic one-hour switch-off, first held in Sydney in 2007, has become an annual global event and organisers World Wide Fund for Nature (WWF) said they expect this year's to be the biggest so far.

The remote Chatham Islands was the first of more than 100 nations and territories to turn off the power at 8.30 p.m. local time, in a rolling event around the globe that ends just across the International Dateline in Samoa 24 hours later.

Tiny Tuvalu, which fears being wiped off the map from rising sea levels, tried to go carbon-neutral for the event, pledging to cut power to its nine low-lying Pacific atolls and asking car and motorcycle owners to stay off the roads, WWF said.

Far to the south in Antarctica, Australia's Davis research station pledged to dim the lights.

Event co-founder Andy Ridley told Reuters that thousands of special events scheduled, including a lights-out party on Sydney's northern beaches and an Earth Hour 'speed dating' contest.

The number of participants is significantly up on 2009, when 88 countries and territories and more than 4,000 towns and cities took part. Organisers have estimated between 500 million and 700 million people were involved last year.

In Singapore, more than 1,000 people gathered for an Earth Hour carnival in the city centre to watch the lights go out at office towers, hotels and other landmarks.

However, lights could still be seen from some buildings and construction sites, disappointing some in the crowd.

"I'm disappointed because most of the buildings' lights are not switched off," said Mat Idris, 26. "I had expected more support from companies," he added.

Thousands, many of them wearing black Earth Hour T-shirts, joined the main switch-off event in the Philippine capital Manila at the sprawling SM Mall of Asia.

Around 15 million Filipinos were expected to participate, according to WWF, to save the equivalent of 5 million pesos (nearly $110,000) worth of electricity.

Taipei 101, the world's second tallest building, turned off all exterior lights and persuaded 99 percent of its tenants to do the same for an hour, the tower's spokesman said.

Frustration

Ridley, WWF's executive director of Earth Hour, said he believed the perceived failure of last year's Copenhagen conference on climate change had stimulated interest this time.

"There is real frustration with the politics around climate change," Ridley told Reuters.

Business had shown strong support, he said, including the world's major hotel chains, which he said are responsible for a significant chunk of global emissions.

In India, Delhi's Red Fort will go dark, as will the pyramids and the Sphinx in Egypt and Rio de Janeiro's Christ the Redeemer statue.

Lights will also go out on all the bridges over the Seine in Paris, London's Buckingham Palace and Tower Bridge, while in the United States, more than 30 of the 50 state governors have lent their support.

Some, though, criticised the event.

"To hold a candles-and-champagne party indoors, on the mildest night of the year, for just one hour, shows that the whole thing is green tokenism," said Viv Forbes, chairman of climate change sceptic group the Carbon Sense Coalition.