This view of Sydney's skyline from the Royal Botanical Gardens was taken at twilight. Earth Hour is an annual international event that is held by World Wildlife Fund on the last Saturday of March, that asks households and businesses to turn off their non-essential lights and electrical appliances for one hour to raise awareness towards the need to take action on climate change. It was pioneered by WWF Australia in Sydney in 2007 and then 35 countries and over 400 cities participated in 2008. This year there will be 74 countries participating and many people plan to be involved across Australia with many special candle-lit events planned at restaurants, cafes and bars around Sydney tonight at 8.30pm.
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