Earth Hour 2013 is from 8:30 to 9:30 p.m. Saturday, March 23.
Earth Hour is World Wildlife Fund's global initative where individuals, schools, organizations, businesses and governments turn off their lights for one hour to cast a vote in favor of action on climate change.
Residents are encouraged to turn off non-essential lighting in their homes during this hour.
Earth Hour is a simple idea that quickly turned into a global phenomenon, according to World Wildlife. Hundreds of millions of people around the world turn off their lights for one hour on the same night, to focus on the one thing that unites us all—our planet.