Earth Hour is observed annually on the last Saturday of March, encouraging individuals, communities, and businesses worldwide to turn off non-essential electric lights for one hour, from 8:30 p.m. to 9:30 p.m. This event was created by the World Wide Fund for Nature (W.W.F.) to raise awareness about climate change and promote environmental responsibility. Initially started in Sydney, Australia, in 2007, Earth Hour has grown into a global movement, with millions participating by switching off their lights as a symbol of commitment to the planet. The event serves as a reminder that even small actions can contribute to a larger impact on environmental conservation.