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.

Tonight, for the 15th consecutive year, people around the world will turn off their lights for one hour. Its part of a grassroots global campaign called Earth Hour. Earth Hour is an annual tradition… [+1699 chars]

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