Darkness will fall all around the world this Saturday at 8:30 pm*. That's when global citizens, along with the World Wildlife Fund (WWF) will come together to call for action on climate change by doing something quite simple - turning off their lights for one hour.
Last year, nearly one billion people turned out for Earth Hour in 4,100 cities in 87 countries on seven continents. WFF expects millions more in over 115 countries to participate this year.
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