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Earth Hour 2010 was held from 8:30 p.m. to 9:30 p.m. local time, March 27. In Israel, the hour was held on April 22.

Earth Hour 2010 was reportedly the biggest Earth Hour yet, aiming to garner more than the one billion participant goal of 2009's Earth Hour. 126 countries have signed up for Earth Hour 2010.

Vietnam electricity demand fell 500,000 kWh during Earth Hour 2010, which was three times larger than the first time the country joined the event in 2009.

About 4000 cities participated, including landmarks such as Big Ben, the Empire State Building, the Sydney Opera House, the Eiffel Tower, the Brandenburg Gate, and the Forbidden City.

These two photos show Malaysia's landmark Petronas Twin Towers before, left, and after being turned off its lights to mark Earth Hour in Kuala Lumpur, Malaysia, Saturday, March 27, 2010.

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Overview of Hong Kong Island and Kowloon with lights on and off to mark Earth Hour 2010

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A before-and-after view of the Las Vegas Strip seen during Earth Hour from Mix at THEhotel at Mandalay Bay March 27, 2010 in Las Vegas, Nevada.

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Before and after views of Seattle's Pacific Science Center on Earth Day, March 27th, 2010.

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A pair of photos of Ion Orchard, one of the largest shopping malls on Orchard Road during Earth Hour in Singapore March 27, 2010.

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The National Stadium, also known as the "Bird's Nest", before and during Earth Hour in Beijing, China March 27, 2010.

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Moscow State University seen before and after the lights are turned off during the worldwide Earth Hour, a global campaign to highlight the threat of climate change in Moscow Saturday, March 27, 2010.

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The Sydney skyline is seen before and after the lights are switched off for Earth Hour on March 27, 2010 in Sydney, Australia. Earth hour this year aims to highlight everyone’s environmental footprint on the earth, encouraging individuals to reduce their impact on the planet and help reduce pollution and climate change

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The hill of the Acropolis before and during Earth Hour in Athens, Greece on March 27, 2010.

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A before-and-during view of a square near the Bundaran Hotel in Jakarta, Indonesia.