Lights have been turned off across Australia’s largest city, Sydney, in a hour-long event aimed at raising awareness of global warming.
At 1930 (0930 GMT) the city’s skyline dimmed and normally bright landmarks like the Opera House and the Harbour Bridge went dark.
The so-called Earth Hour is supported by the New South Wales government, environmental groups and businesses.
Sydney hopes the event will make a very big statement on climate change.
The city of four million people is aiming to become the first anywhere to achieve a blackout on this scale.
Link, WWF.
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