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Earth Hour Dubai

This combo image shows the lights of the Burj Khalifa tower lit up (TOP) before being switched off for an hour in Downtown Dubai, on March 23, 2013, as iconic landmarks and skylines are plunged into darkness as the "Earth Hour" switch-off of lights around the world got under way to raise awareness of climate change. AFP PHOTO/KARIM SAHIB

World landmarks switch off for Earth Hour

From the Burj Khalifa to the Empire State Building, landmarks around the world turned off the lights for an hour from 8.30pm local time on March 23.