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Photograph by Jake Dobkin

Today between 8 p.m. and 9 p.m., people in timezones all over the world will be turning off their lights for Earth Hour. World Wildlife Fund started the event as a way to "deliver a powerful message to the citizens and leaders of the world about the need for action."

Twenty-eight cities are officially participating--in San Francisco, the Golden Gate Bridge will go dark--others, like NYC and LA, are not. However, time may tell as it originated in Sydney last year (the Sydney Opera House's lights will be turned off) and grew from there. Heck, McDonald's is turning off all of its golden arches in Canada!

While some people might think of Earth Hour as stunt, it's still a good time to review ways to conserve energy. Here are 100 tips from Con Edison and tips from the NRDC. When we interviewed actor-environmentalist Ed Begley Jr., he made some suggestions, like buying locally and putting non-essential power on a power strip that you switch off when you're not home.