Sydney's iconic Opera House and Harbour Bridge went dark Saturday night as the world's first major city turned down its lights for this year's Earth Hour, a global campaign to raise awareness of climate change.
'Earth Hour' aims for complete power shutdown for one hour, between 8pm - 9pm on March 29.
http://www.ibnlive.com/news/switch-your-lights-off-earth-hour-on-29-march/62192-20.html
As many as 30 million people are tipped to switch off lights on March 29.
http://www.ibnlive.com/news/lights-off-24-cities-to-go-dark-for-earth-hour/59358-11.html
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