Earth Hour 2012

Hong Kong's Victoria harbour waterfront is seen with its lights dimmed during Earth Hour. Australia's Sydney Harbour Bridge and Opera House were plunged into darkness for the annual Earth Hour campaign, leading a global effort to raise awareness about climate change

Hong Kong's Victoria harbour waterfront is seen with its lights dimmed during Earth Hour. Australia's Sydney Harbour Bridge and Opera House were plunged into darkness for the annual Earth Hour campaign, leading a global effort to raise awareness about climate change