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Sri Lankan youths hold up torches to mark Earth Hour in Colombo March 23, 2013. EarthHour, when everyone around the world is asked to turn off lights for an hour from 8.30 p.m. local time, is meant as a show of support for tougher action to confront climate change. (Photo by Dinuka Liyanawatte/Reuters)

Sri Lankan youths hold up torches to mark Earth Hour in Colombo March 23, 2013. EarthHour, when everyone around the world is asked to turn off lights for an hour from 8.30 p.m. local time, is meant as a show of support for tougher action to confront climate change. (Photo by Dinuka Liyanawatte/Reuters)




People hold candles during an event attempting to establish a Guinness World of Record for “Blowing out the most number of candles simultaneously” during Earth Hour in Shanghai March 23, 2013. Earth Hour, when everyone around the world is asked to turn off lights for an hour from 8.30 p.m. local time, is meant as a show of support for tougher action to confront climate change. (Photo by Carlos Barria/Reuters)

People hold candles during an event attempting to establish a Guinness World of Record for “Blowing out the most number of candles simultaneously” during Earth Hour in Shanghai March 23, 2013. Earth Hour, when everyone around the world is asked to turn off lights for an hour from 8.30 p.m. local time, is meant as a show of support for tougher action to confront climate change. (Photo by Carlos Barria/Reuters)




People hold candles during an event attempting to establish a Guinness World of Record for “Blowing out the most number of candles simultaneously” during Earth Hour in Shanghai March 23, 2013. Earth Hour, when everyone around the world is asked to turn off lights for an hour from 8.30 p.m. local time, is meant as a show of support for tougher action to confront climate change. (Photo by Carlos Barria/Reuters)

People hold candles during an event attempting to establish a Guinness World of Record for “Blowing out the most number of candles simultaneously” during Earth Hour in Shanghai March 23, 2013. Earth Hour, when everyone around the world is asked to turn off lights for an hour from 8.30 p.m. local time, is meant as a show of support for tougher action to confront climate change. (Photo by Carlos Barria/Reuters)




Students gather around candles during Earth Hour in Hanoi March 23, 2013. Earth Hour, when everyone around the world is asked to turn off lights for an hour from 8.30 p.m. local time, is meant as a show of support for tougher action to confront climate change. (Photo by Kham/Reuters)

Students gather around candles during Earth Hour in Hanoi March 23, 2013. Earth Hour, when everyone around the world is asked to turn off lights for an hour from 8.30 p.m. local time, is meant as a show of support for tougher action to confront climate change. (Photo by Kham/Reuters)




Singer Tung Duong (C) performs with children during Earth Hour in front of the Opera House in Hanoi, Vietnam, on March 23, 2013. Earth Hour, when everyone around the world is asked to turn off lights for an hour from 8.30 p.m. local time, is meant as a show of support for tougher action to confront climate change. (Photo by Kham/Reuters)

Singer Tung Duong (C) performs with children during Earth Hour in front of the Opera House in Hanoi, Vietnam, on March 23, 2013. Earth Hour, when everyone around the world is asked to turn off lights for an hour from 8.30 p.m. local time, is meant as a show of support for tougher action to confront climate change. (Photo by Kham/Reuters)




A fruit seller works in candlelight to mark Earth Hour in a shopping district of Bangalore, India, Saturday, March 23, 2013. Earth Hour was marked worldwide at 8.30 p.m. local time and is a global call to turn off lights for 60 minutes in a bid to highlight the global climate change. (Photo by Aijaz Rahi/AP Photo)

A fruit seller works in candlelight to mark Earth Hour in a shopping district of Bangalore, India, Saturday, March 23, 2013. Earth Hour was marked worldwide at 8.30 p.m. local time and is a global call to turn off lights for 60 minutes in a bid to highlight the global climate change. (Photo by Aijaz Rahi/AP Photo)




People light candles to mark Earth Hour at the Ritz Carlton in Riyadh, March 23, 2013. Earth Hour, when everyone around the world is asked to turn off the lights for an hour from 8.30pm local time, is meant as a show of support for tougher actions to combat climate change. (Photo by Reuters/Stringer)

People light candles to mark Earth Hour at the Ritz Carlton in Riyadh, March 23, 2013. Earth Hour, when everyone around the world is asked to turn off the lights for an hour from 8.30pm local time, is meant as a show of support for tougher actions to combat climate change. (Photo by Reuters/Stringer)




Emiratis light candles to mark Earth Hour near Burj Khalifa in Dubai, March 23, 2013. Earth Hour, when everyone around the world is asked to turn off the lights for an hour from 8.30pm local time, is meant as a show of support for tougher actions to combat climate change. (Photo by Jumana El Heloueh/Reuters)

Emiratis light candles to mark Earth Hour near Burj Khalifa in Dubai, March 23, 2013. Earth Hour, when everyone around the world is asked to turn off the lights for an hour from 8.30pm local time, is meant as a show of support for tougher actions to combat climate change. (Photo by Jumana El Heloueh/Reuters)




A combination photo shows the castle of Thun before (top) and during Earth Hour in the city of Thun near Bern March 23, 2013. Earth Hour, when everyone around the world is asked to turn off the lights for an hour from 8.30 pm local time, is meant as a show of support for tougher actions to combat climate change. (Photo by Ruben Sprich/Reuters)

A combination photo shows the castle of Thun before (top) and during Earth Hour in the city of Thun near Bern March 23, 2013. Earth Hour, when everyone around the world is asked to turn off the lights for an hour from 8.30 pm local time, is meant as a show of support for tougher actions to combat climate change. (Photo by Ruben Sprich/Reuters)




A combination of pictures shows the medieval Charles Bridge in Prague before (top) and during Earth Hour March 23, 2013. Earth Hour, when everyone around the world is asked to turn off lights for an hour from 8.30 p.m. local time, is meant as a show of support for tougher action to confront climate change. (Photo by Petr Josek/Reuters)

A combination of pictures shows the medieval Charles Bridge in Prague before (top) and during Earth Hour March 23, 2013. Earth Hour, when everyone around the world is asked to turn off lights for an hour from 8.30 p.m. local time, is meant as a show of support for tougher action to confront climate change. (Photo by Petr Josek/Reuters)




People hold candles during Earth Hour after the lights were turned off in central Amman March 23, 2013. Earth Hour, when everyone around the world is asked to turn off lights for an hour from 8.30 p.m. local time, is meant as a show of support for tougher actions to confront climate change. Picture taken with long exposure. (Photo by Ali Jarekji/Reuters)

People hold candles during Earth Hour after the lights were turned off in central Amman March 23, 2013. Earth Hour, when everyone around the world is asked to turn off lights for an hour from 8.30 p.m. local time, is meant as a show of support for tougher actions to confront climate change. Picture taken with long exposure. (Photo by Ali Jarekji/Reuters)




A combination photo shows a view of St. Basil's Cathedral, Red Square and the Kremlin before (top) and during Earth Hour in Moscow March 23, 2013. Earth Hour, when everyone around the world is asked to turn off the lights for an hour from 8.30pm local time, is meant as a show of support for tougher actions to combat climate change. (Photo by Mikhail Voskresensky/Reuters)

A combination photo shows a view of St. Basil's Cathedral, Red Square and the Kremlin before (top) and during Earth Hour in Moscow March 23, 2013. Earth Hour, when everyone around the world is asked to turn off the lights for an hour from 8.30pm local time, is meant as a show of support for tougher actions to combat climate change. (Photo by Mikhail Voskresensky/Reuters)




A combination picture shows the city hall in the evening of March 21, 2013 (top) and during Earth Hour in Vienna March 23, 2013. Earth Hour, when everyone around the world is asked to turn off the lights for an hour from 8.30 pm local time, is meant as a show of support for tougher actions to combat climate change. (Photo by Heinz-Peter Bader/Reuters)

A combination picture shows the city hall in the evening of March 21, 2013 (top) and during Earth Hour in Vienna March 23, 2013. Earth Hour, when everyone around the world is asked to turn off the lights for an hour from 8.30 pm local time, is meant as a show of support for tougher actions to combat climate change. (Photo by Heinz-Peter Bader/Reuters)




A woman ignites candles during Earth Hour in the city centre of Frankfurt March 23, 2013. Earth Hour, when everyone around the world is asked to turn off lights for an hour from 8.30 p.m. local time, is meant as a show of support for action to confront climate change. (Photo by Lisi Niesner/Reuters)

A woman ignites candles during Earth Hour in the city centre of Frankfurt March 23, 2013. Earth Hour, when everyone around the world is asked to turn off lights for an hour from 8.30 p.m. local time, is meant as a show of support for action to confront climate change. (Photo by Lisi Niesner/Reuters)




A combination picture shows Hofburg Palace before (top) and during Earth Hour in Vienna March 23, 2013. Earth Hour, when everyone around the world is asked to turn off the lights for an hour from 8.30 pm local time, is meant as a show of support for tougher actions to combat climate change. (Photo by Heinz-Peter Bader/Reuters)

A combination picture shows Hofburg Palace before (top) and during Earth Hour in Vienna March 23, 2013. Earth Hour, when everyone around the world is asked to turn off the lights for an hour from 8.30 pm local time, is meant as a show of support for tougher actions to combat climate change. (Photo by Heinz-Peter Bader/Reuters)




Children hold candles during Earth Hour after the lights were turned off in central Amman March 23, 2013. Earth Hour, when everyone around the world is asked to turn off lights for an hour from 8.30 p.m. local time, is meant as a show of support for tougher actions to confront climate change. (Photo by Ali Jarekji/Reuters)

Children hold candles during Earth Hour after the lights were turned off in central Amman March 23, 2013. Earth Hour, when everyone around the world is asked to turn off lights for an hour from 8.30 p.m. local time, is meant as a show of support for tougher actions to confront climate change. (Photo by Ali Jarekji/Reuters)




Emiratis light candles to mark Earth Hour near Burj Khalifa in Dubai, March 23, 2013. Earth Hour, when everyone around the world is asked to turn off the lights for an hour from 8.30pm local time, is meant as a show of support for tougher actions to combat climate change. (Photo by Jumana El Heloueh/Reuters)

Emiratis light candles to mark Earth Hour near Burj Khalifa in Dubai, March 23, 2013. Earth Hour, when everyone around the world is asked to turn off the lights for an hour from 8.30pm local time, is meant as a show of support for tougher actions to combat climate change. (Photo by Jumana El Heloueh/Reuters)




A two photo combination showing the Elizabeth Tower, which houses Big Ben at the Houses of Parliament in London, illuminated, left, and then in darkness as the lights were turned off to mark Earth Hour 2013, Saturday March 23, 2013. Earth Hour was marked worldwide at 8.30 p.m. local time and is a global call to turn off lights for 60 minutes in a bid to highlight the global climate change. (Photo by Lewis Whyld/AP Photo/PA)

A two photo combination showing the Elizabeth Tower, which houses Big Ben at the Houses of Parliament in London, illuminated, left, and then in darkness as the lights were turned off to mark Earth Hour 2013, Saturday March 23, 2013. Earth Hour was marked worldwide at 8.30 p.m. local time and is a global call to turn off lights for 60 minutes in a bid to highlight the global climate change. (Photo by Lewis Whyld/AP Photo/PA)




A combination photo shows the old opera and the opera tower during (top) Earth Hour, and after Earth Hour in Frankfurt March 23, 2013. Earth Hour, when everyone around the world is asked to turn off lights for an hour from 8.30 p.m. local time, is meant as a show of support for action to confront climate change. (Photo by Lisi Niesner/Reuters)

A combination photo shows the old opera and the opera tower during (top) Earth Hour, and after Earth Hour in Frankfurt March 23, 2013. Earth Hour, when everyone around the world is asked to turn off lights for an hour from 8.30 p.m. local time, is meant as a show of support for action to confront climate change. (Photo by Lisi Niesner/Reuters)




A combination of pictures shows the medieval Charles Bridge in Prague before (top) and during Earth Hour March 23, 2013. Earth Hour, when everyone around the world is asked to turn off lights for an hour from 8.30 p.m. local time, is meant as a show of support for tougher action to confront climate change. (Photo by Petr Josek/Reuters)

A combination of pictures shows the medieval Charles Bridge in Prague before (top) and during Earth Hour March 23, 2013. Earth Hour, when everyone around the world is asked to turn off lights for an hour from 8.30 p.m. local time, is meant as a show of support for tougher action to confront climate change. (Photo by Petr Josek/Reuters)




The Singapore city-skyline is seen in darkness against the lit highway as lights in major buildings around the financial district are switched off for a whole hour on Saturday, March 23, 2013 in Singapore. More than 100 buildings, locations and organizations in Singapore switched off their lights as part of the global Earth Hour initiative by World Wide Fund for Nature (WWF) along with other national monuments around the world. (Photo by Wong Maye-E/AP Photo)

The Singapore city-skyline is seen in darkness against the lit highway as lights in major buildings around the financial district are switched off for a whole hour on Saturday, March 23, 2013 in Singapore. More than 100 buildings, locations and organizations in Singapore switched off their lights as part of the global Earth Hour initiative by World Wide Fund for Nature (WWF) along with other national monuments around the world. (Photo by Wong Maye-E/AP Photo)




The Parthenon temple stands atop the Acropolis hill after turning off the lights to mark the annual Earth Hour in Athens, on Saturday March 23, 2013. In Greece, floodlights in several monuments and public buildings were switched off for one hour at 8:30 p.m. local time. Thousands of businesses and municipalities also dimmed their lights. (Photo by Kostas Tsironis/AP Photo)

The Parthenon temple stands atop the Acropolis hill after turning off the lights to mark the annual Earth Hour in Athens, on Saturday March 23, 2013. In Greece, floodlights in several monuments and public buildings were switched off for one hour at 8:30 p.m. local time. Thousands of businesses and municipalities also dimmed their lights. (Photo by Kostas Tsironis/AP Photo)




A combination picture shows the financial Central District of Hong Kong (top) before Earth Hour, and during Earth Hour March 23, 2013. Earth Hour, when everyone around the world is asked to turn off lights for an hour from 8.30 p.m. local time, is meant as a show of support for tougher action to confront climate change. (Photo by Bobby Yip/Reuters)

A combination picture shows the financial Central District of Hong Kong (top) before Earth Hour, and during Earth Hour March 23, 2013. Earth Hour, when everyone around the world is asked to turn off lights for an hour from 8.30 p.m. local time, is meant as a show of support for tougher action to confront climate change. (Photo by Bobby Yip/Reuters)




The Taipei 101 Building is seen darkened during the Earth Hour in Taipei, Taiwan, Saturday, March 23, 2013. Organised by the World Wide Fund for Nature, earth hour is observed every year to create awareness about conservation of energy and climate change. Around the world, people and organisations will be turning their lights off from 8:30 to 9:30 pm local time. (Photo by Chiang Ying-ying/AP Photo)

The Taipei 101 Building is seen darkened during the Earth Hour in Taipei, Taiwan, Saturday, March 23, 2013. Organised by the World Wide Fund for Nature, earth hour is observed every year to create awareness about conservation of energy and climate change. Around the world, people and organisations will be turning their lights off from 8:30 to 9:30 pm local time. (Photo by Chiang Ying-ying/AP Photo)




Muslim women light candles during the “EarthHour” in Jakarta, Indonesia, on March 23, 2013. Hundreds of people observed the global event that encourages people to turn off their lights for 60 minutes. (Photo by Dita Alangkara/Associated Press)

Muslim women light candles during the “EarthHour” in Jakarta, Indonesia, on March 23, 2013. Hundreds of people observed the global event that encourages people to turn off their lights for 60 minutes. (Photo by Dita Alangkara/Associated Press)




A combination picture shows the central business district (CBD) of Sydney on March 21, 2013 (top) before Earth Hour, and during Earth Hour March 23, 2013. Earth Hour, when everyone around the world is asked to turn off lights for an hour from 8.30 p.m. local time, is meant as a show of support for tougher action to confront climate change. (Photo by Daniel Munoz/Reuters)

A combination picture shows the central business district (CBD) of Sydney on March 21, 2013 (top) before Earth Hour, and during Earth Hour March 23, 2013. Earth Hour, when everyone around the world is asked to turn off lights for an hour from 8.30 p.m. local time, is meant as a show of support for tougher action to confront climate change. (Photo by Daniel Munoz/Reuters)




Children hold candles while participating in a candlelight vigil to mark Earth Hour in Mumbai March 23, 2013. Earth Hour, when everyone around the world is asked to turn off lights for an hour from 8.30 p.m. local time, is meant as a show of support for tougher actions to confront climate change. (Photo by Danish Siddiqui/Reuters)

Children hold candles while participating in a candlelight vigil to mark Earth Hour in Mumbai March 23, 2013. Earth Hour, when everyone around the world is asked to turn off lights for an hour from 8.30 p.m. local time, is meant as a show of support for tougher actions to confront climate change. (Photo by Danish Siddiqui/Reuters)




Onlookers watch Taipei 101 building as it turns its lights off to observe international “Earth Hour” in Taiwan, on March 23, 2013. Around 100 people gathered outside the skyscraper Saturday, using energy saving LED lights to observe the global event that encourages people to turn off their lights for an hour. (Photo by Wally Santana/Associated Press)

Onlookers watch Taipei 101 building as it turns its lights off to observe international “Earth Hour” in Taiwan, on March 23, 2013. Around 100 people gathered outside the skyscraper Saturday, using energy saving LED lights to observe the global event that encourages people to turn off their lights for an hour. (Photo by Wally Santana/Associated Press)



In this composite image the Opera House is seen before on March 21 (top) and after the lights were powered by “GreenPower” and glowed dark green to recognize Earth Hour on March 23, 2013 in Sydney, Australia. Businesses and households around the world will turn their lights off for on hour at 20:30 local time today, to celebrate Earth Hour, raise awareness about climate change and to show support for the use of renewable energy. Earth hour began in Sydney in 2007 and is now celebrated in over 150 countries around the world. (Photo by Lisa Maree Williams)

In this composite image the Opera House is seen before on March 21 (top) and after the lights were powered by “GreenPower” and glowed dark green to recognize Earth Hour on March 23, 2013 in Sydney, Australia. Businesses and households around the world will turn their lights off for on hour at 20:30 local time today, to celebrate Earth Hour, raise awareness about climate change and to show support for the use of renewable energy. Earth hour began in Sydney in 2007 and is now celebrated in over 150 countries around the world. (Photo by Lisa Maree Williams)




In this composite image the Sydney Harbour Bridge is seen before on March 21 (top) and after the lights were switched off to recognize Earth Hour on March 23, 2013 in Sydney, Australia. Businesses and households around the world will turn their lights off for one hour at 20:30 local time today, to celebrate Earth Hour, raise awareness about climate change and to show support for the use of renewable energy. Earth hour began in Sydney in 2007 and is now celebrated in over 150 countries around the world. (Photo by Lisa Maree Williams)

In this composite image the Sydney Harbour Bridge is seen before on March 21 (top) and after the lights were switched off to recognize Earth Hour on March 23, 2013 in Sydney, Australia. Businesses and households around the world will turn their lights off for one hour at 20:30 local time today, to celebrate Earth Hour, raise awareness about climate change and to show support for the use of renewable energy. Earth hour began in Sydney in 2007 and is now celebrated in over 150 countries around the world. (Photo by Lisa Maree Williams)




This photo combo shows the landmark Seoul City Hall illuminated (top) and with lights turned off (bottom) during the 7th annual Earth Hour global warming campaign in Seoul on March 23, 2013. One minute brightly lit, the next plunged into darkness – iconic landmarks around the world will cut their lights on March 23 for the “Earth Hour” campaign against climate change. (Photo by Kim Jae-Hwan/AFP Photo)

This photo combo shows the landmark Seoul City Hall illuminated (top) and with lights turned off (bottom) during the 7th annual Earth Hour global warming campaign in Seoul on March 23, 2013. One minute brightly lit, the next plunged into darkness – iconic landmarks around the world will cut their lights on March 23 for the “Earth Hour” campaign against climate change. (Photo by Kim Jae-Hwan/AFP Photo)




This combo of pictures shows the National Stadium, known as the Bird's Nest with the lights on (top) and with the lights off (bottom) during the annual Earth Hour event in Beijing on March 23, 2013. Millions of people were expected to switch off their lights for Earth Hour on March 23 in a global effort to raise awareness about climate change that was even to be monitored from space. (Photo by Wang Zhao/AFP Photo)

This combo of pictures shows the National Stadium, known as the Bird's Nest with the lights on (top) and with the lights off (bottom) during the annual Earth Hour event in Beijing on March 23, 2013. Millions of people were expected to switch off their lights for Earth Hour on March 23 in a global effort to raise awareness about climate change that was even to be monitored from space. (Photo by Wang Zhao/AFP Photo)




The Singapore city skyline is seen before (top) and after the lights were switched off to recognize Earth Hour on March 23, 2013 in Singapore, Singapore. Businesses and households around the world switch their lights off for an hour at 20:30 local time on March 23, to celebrate Earth Hour and raise awareness about climate change and renewable energy. Earth hour began in Australia in 2007 and is now celebrated in over 150 countries around the world. (Photo by Suhaimi Abdullah)

The Singapore city skyline is seen before (top) and after the lights were switched off to recognize Earth Hour on March 23, 2013 in Singapore, Singapore. Businesses and households around the world switch their lights off for an hour at 20:30 local time on March 23, to celebrate Earth Hour and raise awareness about climate change and renewable energy. Earth hour began in Australia in 2007 and is now celebrated in over 150 countries around the world. (Photo by Suhaimi Abdullah)




This composite photograph shows a huge LED sky screen before and during the Earth Hour 2013 power switch off at the Central Business District on March 23, 2013 in Beijing, China. Earth Hour, launched in 2007 in Australia by the World Wide Fund for Nature (WWF), a global conservation group, calls on people, organizations and cities to turn off their non-essential lights for one hour starting at 8:30 p.m. local time. (Photo by Feng Li)

This composite photograph shows a huge LED sky screen before and during the Earth Hour 2013 power switch off at the Central Business District on March 23, 2013 in Beijing, China. Earth Hour, launched in 2007 in Australia by the World Wide Fund for Nature (WWF), a global conservation group, calls on people, organizations and cities to turn off their non-essential lights for one hour starting at 8:30 p.m. local time. (Photo by Feng Li)




In this combination photo the China National Stadium, known as the Bird's Nest, with lights on (top) and off, is seen during the Earth Hour in Beijing on March 23,2013. Iconic landmarks and skylines were plunged into darkness on Saturday as the “Earth Hour” switch-off of lights around the world got under way to raise awareness of climate change. (Photo by Wang Zhao/AFP Photo)

In this combination photo the China National Stadium, known as the Bird's Nest, with lights on (top) and off, is seen during the Earth Hour in Beijing on March 23,2013. Iconic landmarks and skylines were plunged into darkness on Saturday as the “Earth Hour” switch-off of lights around the world got under way to raise awareness of climate change. (Photo by Wang Zhao/AFP Photo)




This combo  shows the lighted National Monument at left and the dome of Istiqlal mosque at right in the Indonesia's capital city of Jakarta with lights in the top photograph taken on March 22, 2013 and the bottom photograph taken during “Earth Hour” event on March 23, 2013 with the National Monument lights switched off. Iconic landmarks and skylines were plunged into darkness on Saturday as the “Earth Hour” switch-off of lights around the world got under way to raise awareness of climate change. While more than 150 countries took part in last year's event, the movement has spread even further afield this year, with Palestine, Tunisia, Suriname and Rwanda among a host of newcomers pledging to take part. (Photo by Romeo Gacad/AFP Photo)

This combo shows the lighted National Monument at left and the dome of Istiqlal mosque at right in the Indonesia's capital city of Jakarta with lights in the top photograph taken on March 22, 2013 and the bottom photograph taken during “Earth Hour” event on March 23, 2013 with the National Monument lights switched off. Iconic landmarks and skylines were plunged into darkness on Saturday as the “Earth Hour” switch-off of lights around the world got under way to raise awareness of climate change. While more than 150 countries took part in last year's event, the movement has spread even further afield this year, with Palestine, Tunisia, Suriname and Rwanda among a host of newcomers pledging to take part. (Photo by Romeo Gacad/AFP Photo)




This two combo photograph shows the lighted Welcome Monument located in central Indonesia's capital city of Jakarta with lights on in the top photograph and bottom photograph taken during “Earth Hour” event on March 23, 2013 with the monument's lights switched off. Iconic landmarks and skylines were plunged into darkness on Saturday as the “Earth Hour” switch-off of lights around the world got under way to raise awareness of climate change. While more than 150 countries took part in last year's event, the movement has spread even further afield this year, with Palestine, Tunisia, Suriname and Rwanda among a host of newcomers pledging to take part. (Photo by Romeo Gacad/AFP Photo)

This two combo photograph shows the lighted Welcome Monument located in central Indonesia's capital city of Jakarta with lights on in the top photograph and bottom photograph taken during “Earth Hour” event on March 23, 2013 with the monument's lights switched off. Iconic landmarks and skylines were plunged into darkness on Saturday as the “Earth Hour” switch-off of lights around the world got under way to raise awareness of climate change. While more than 150 countries took part in last year's event, the movement has spread even further afield this year, with Palestine, Tunisia, Suriname and Rwanda among a host of newcomers pledging to take part. (Photo by Romeo Gacad/AFP Photo)




Combination photo shows The Eiffel Tower submerging into darkness at 8:30 pm (local time) as part of the Earth Hour switch-off on March 23, 2013 in Paris. Organisers expect hundreds of millions of people across more than 150 countries to turn off their lights for 60 minutes on Saturday night – at 8:30 pm local time – in a symbolic show of support for the planet. While more than 150 countries joined in last year's event, the movement has spread even further afield this year, with Palestine, Tunisia, Suriname and Rwanda among a host of newcomers pledging to take part. (Photo by Bertrand Langlois/AFP Photo)

Combination photo shows The Eiffel Tower submerging into darkness at 8:30 pm (local time) as part of the Earth Hour switch-off on March 23, 2013 in Paris. Organisers expect hundreds of millions of people across more than 150 countries to turn off their lights for 60 minutes on Saturday night – at 8:30 pm local time – in a symbolic show of support for the planet. While more than 150 countries joined in last year's event, the movement has spread even further afield this year, with Palestine, Tunisia, Suriname and Rwanda among a host of newcomers pledging to take part. (Photo by Bertrand Langlois/AFP Photo)




In this combo photo shows the 100-foot LAX Gateway pylons at Los Angeles International Airport are lit green (top) for an hour on March 23, 2013 in Los Angeles, California, before being turned off (bottom) and going dark for the following hour to commemorate Earth Hour 2013, with the annual global campaign engaging more than 150 nations to voluntarily participate in the no-lights show this year. (Photo by Frederic J. Brown/AFP Photo)

In this combo photo shows the 100-foot LAX Gateway pylons at Los Angeles International Airport are lit green (top) for an hour on March 23, 2013 in Los Angeles, California, before being turned off (bottom) and going dark for the following hour to commemorate Earth Hour 2013, with the annual global campaign engaging more than 150 nations to voluntarily participate in the no-lights show this year. (Photo by Frederic J. Brown/AFP Photo)




In this composite image, The Bank of China Tower, Cheung Kong Centre, HSBC building and Standard Charter Bank Building are seen before (top) and after the lights were switched off to recognize Earth Hour on on March 23, 2013 in Hong Kong, Hong Kong. Businesses and households around the world will turn their lights off for on hour at 20:30 local time today, to celebrate Earth Hour, raise awareness about climate change and to show support for the use of renewable energy. Earth hour began in Australia in 2007 and is now celebrated in over 150 countries around the world. (Photo by Jessica Hromas)

In this composite image, The Bank of China Tower, Cheung Kong Centre, HSBC building and Standard Charter Bank Building are seen before (top) and after the lights were switched off to recognize Earth Hour on on March 23, 2013 in Hong Kong, Hong Kong. Businesses and households around the world will turn their lights off for on hour at 20:30 local time today, to celebrate Earth Hour, raise awareness about climate change and to show support for the use of renewable energy. Earth hour began in Australia in 2007 and is now celebrated in over 150 countries around the world. (Photo by Jessica Hromas)




In this combo photo shows the Monumento a la Revolucion with color lights on (top) and lights were turned off (bottom) to mark “Earth Hour” in Republica Square in Mexico City on March 23, 2013.  Millions of people were expected to switch off their lights for Earth Hour in a global effort to raise awareness about climate change. (Photo by Alfredo Estrella/AFP Photo)

In this combo photo shows the Monumento a la Revolucion with color lights on (top) and lights were turned off (bottom) to mark “Earth Hour” in Republica Square in Mexico City on March 23, 2013. Millions of people were expected to switch off their lights for Earth Hour in a global effort to raise awareness about climate change. (Photo by Alfredo Estrella/AFP Photo)
24 Mar 2013 09:20:00