The World Wildlife Fund (WWF) created the event called Earth Hour. On Saturday March 29 at 8 PM local time, millions of people and businesses worldwide are turning off their lights to make a statement about climate change.

It all started last year in Sydney Australia. This year, the WWF says more than 200 cities around the world, including 100 in North America, will turn out their lights for the event.

According to the WWF, “Earth Hour will demonstrate that by working together, each one of us can make a positive impact on this global issue. Earth Hour encourages businesses, communities and individuals to take the simple steps needed to cut their carbon dioxide emissions. WWF will hold this event in at least 25 cities across 6 continents. In the U.S. it will be held in Chicago, Atlanta, Phoenix and San Francisco.”

Check it out. Think about your carbon foortprint. Pull out those candles. Just don’t burn the place down!