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Landmarks in cities around the globe are thrown into darkness.
This is the annual Earth Hour...the world-wide blackout of such structures for 60 minutes to draw attention to climate change and the impact of small gestures.
From Asia, to Europe, to North and Latin America the lights dimmed and disappeared.
The event includes some 30 UNESCO World Heritage Sites around the world.
Organisers at the World Wildlife Fund says this year's Earth Hour was marked by more than 170 countries across 24 time zones.
The Fund says the lights-off movement started back in 2007 in Sydney.