Light the way again on March 27th from 8:30 PM to 9:30 PM. Recognizing the contribution individuals can make in tackling climate change.
The first Earth Hour took place in Sydney, Australia in 2007.
In 2008 more than 400 cities around the world participated.
Last year 1 billion people were reached globally.
In 2009, 4000 cities used their light switch to vote for Earth.
Check out Earth Hour 2010.
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