Iconic landmarks participate in Earth Hour 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.
Image 1 of 7: This combination of two photos shows the city skyline lit through the suspension wires of the Singapore Flyer, top, and the city skyline with the lights turned off, bottom. Photo / AP