Earth Hour was created by the World Wildlife Fund (WWF) in Sydney in 2007 as a symbolic lights-out event to raise awareness about climate change.  Held annually on the last Saturday of March, it encourages individuals, businesses, and landmarks worldwide to turn off their lights for one hour in support of the planet. Earth Hour has grown beyond a symbol, sparking global discussions on protecting nature to safeguard human well-being, biodiversity, and sustainability. The movement aims to inspire action for a healthier planet. In 2019, 188 countries and territories participated in Earth Hour, with thousands of landmarks, including the Eiffel Tower, Sydney Opera House, and Empire State Building, going dark to show solidarity. Since its inception, Earth Hour has contributed to significant environmental achievements.  WWF Uganda established the first Earth Hour Forest, while Earth Hour 2013 in Argentina helped pass a Senate bill creating a 3.4-million-hectare Marine Protected Area.  The 2014 Earth Hour City Challenge saw over 2,123 climate mitigation actions submitted by participating cities. Through awareness and action, Earth Hour continues to unite millions in the fight for a sustainable future, proving that small actions can lead to global impact.