
Tonight is Earth Hour. Here's how you can participate
CNN
Tonight, for the 15th consecutive year, people around the world will turn off their lights for one hour. It's part of a grassroots global campaign called Earth Hour.
What is Earth Hour?
Earth Hour is an annual tradition started by the World Wildlife Fund (WWF) in 2007 in Sydney, Australia, to raise awareness about climate change. Participants in more than 190 countries will turn off their lights for one hour on Saturday.
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