These two combo photos show Malaysia's landmark Petronas Twin Towers being turned off the lights to mark Earth Hour in downtown Kuala Lumpur, Malaysia.
A combination picture shows a view of the Kuala Lumpur skyline before (top) and during Earth Hour
A combination picture shows a view of the Bund on the banks of the Huangpu River in Shanghai before (top) and during Earth Hour.
Chinese visitors near the 'Bird Nest' National Stadium which has been darkened for one hour to mark Earth Hour in Beijing, China.
This combo photo shows the general view of commercial buildings before (top) and after (bottom) turning off lights at Hong Kong's central district
A combination picture taken before and after the lights at the main roundabout at the main business district are turned off during Earth Hour in Jakarta, Indonesia.
A view of Taj Mahal hotel before (top) and during Earth Hour in Mumbai.
A night view of the site of the ancient Giza Pyramids before and after switching off the lights for the Earth Hour, in Cairo, Egypt.
The Millenium bridge over the Tyne river before (top) and during Earth Hour in Newcastle, northern England.
A combination of four pictures shows a view of the Eiffel Tower before and during (top-bottom) Earth Hour in Paris.
Rome's ancient Colosseum with its lights on, above, and off, to mark an Earth Hour event.
A view of the Agbar Tower, the latest symbol to mark the Barcelona skyline, before (top) and during Earth Hour March 28, 2009.
A combination of pictures shows a view of the hill of the Acropolis before (top) and during Earth Hour in Athens March 28, 2009. 
101 building in Taipeh, Taiwan.
