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WWF | EARTH HOUR | 2009

One hour of darkness became a gateway to changing the world / WWF "EARTH HOUR"

Just turn off the lights for one hour. That's it—and with that simple act, hundreds of millions of people around the world made a statement about climate change. It's a simple but powerful campaign. Earth Hour started in Sydney in 2007, and by 2009 it had grown to an incredible scale.