We are being asked to turn our power off for one hour between 8:30-9:30 pm.
More than a billion people and 1,000 cities around the globe are expected to turn their lights off for Earth Hour 2009 on Saturday in a collective call to combat climate change.
That single hour reduced power consumption in Sydney by 10 per cent and reduced carbon dioxide emissions by some 25,000 tonnes.
While this collective action alone won't solve worldwide climate woes, it has brought an awareness of what can be done when we work together.
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