Page last updated at 08:11 GMT, Sunday, 29 March 2009 09:11 UK

In pictures: Earth Hour

Skyline of Sydney, Australia - home to the first Earth Hour two years ago

More than 3,400 cities worldwide have taken part in Earth Hour, turning off their lights for one hour at 2030 local time in protest against climate change.

Concert in Wellington Civic Square, New Zealand - photo Earth Hour

New Zealand was one of the first countries to take part. In Wellington, revellers turned the event into a celebration with a candle-lit concert.

Candles in Fiji - Photo Earth Hour

People in Fiji marked the 60 minutes of Earth Hour with candles.

Bird's Nest stadium, Beijing - photo Earth Hour

The normally glittering Bird's Nest stadium in Beijing looked distinctly grey.

Bank of China, HSBC building and others in Hong Kong

Hong Kong's financial district was plunged into near darkness.

The Acropolis in Greece, (above) as it is normally lit and (below) in darkness during Earth Hour

Campaigners in Greece and across the world aim to create a huge wave of public pressure to force a new climate change treaty.

Parliament lit as usual (left) and an unlit Parliament during Earth Hour

And in London, the Houses of Parliament, as well as the London Eye, Canary Wharf, the Gherkin and the BT Tower, switched their lights off.

New York City's Rockefeller Center moments after it went dark

New York, Toronto, Chicago, San Francisco and Las Vegas were among cities in 35 countries that switched off for an hour but critics have dismissed the event as a gimmick that will have little effect.

Casinoes in Las Vegas turned off all non-essential lighting

Even in glittering Las Vegas, some lights were turned off.

Print Sponsor

Cities switch off for environment
30 Mar 08 |  Science & Environment
Landmarks go dark for Earth Hour
28 Mar 09 |  Scotland
Sydney in climate change blackout
31 Mar 07 |  Asia-Pacific

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