Earth Hour is an initiative put forward by the World Wildlife Fund (WWF) to respond to global climate change. It hopes that individuals, communities, businesses and governments will observe on the last Saturday of March every year: 20: 30-21: 30 lights out for one hour to show their support for action on climate change. Climate change caused by excessive carbon dioxide emissions has now greatly threatened the survival of human beings on the earth. Only by changing public attitudes toward carbon dioxide emissions around the world can we mitigate the impact of this threat on the world. Following 2009, on March 27, 2010, the Earth Hour event was launched again around the world.

Earth Hour is an initiative put forward by the World Wildlife Fund (WWF) in response to global climate change. Every year at 20:00 on March 27, the lights are turned off for one hour to call on all mankind to protect the earth's environment and our homeland. Everyone comes to participate. Bar