For 60 minutes, everyone is encouraged to switch off all their lights to support action on climate change.
Last year, 50 million people around the world signed up; 2009 is set to be even bigger, with more than 1,000 cities and towns taking part across 80 countries.
The event shows that - however small your contribution feels - if we all work together on an individual level, we can make a difference. A mentality which Liftshare has always shared.
To do your bit, visit www.earthhour.org
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