Earth Hour "Lights Out Day" is the last Saturday in March every year.

Earth Hour is a global energy-saving event proposed by the World Wildlife Fund (WWF) in response to global climate change. It is advocated on the last Saturday of March every year at 20:00 local time. 30 (Earth Hour in 2022 is at 20:30 pm on March 26), households and business users turn off unnecessary lights and power-consuming products for one hour to show their support for actions to combat climate change.

Climate change caused by excessive carbon dioxide emissions has greatly threatened the survival of human beings on the earth. Therefore, only by changing the global public's attitude towards carbon dioxide emissions can the impact of this threat on the world be reduced.

The origin of "Earth Hour"

"Earth Hour", also known as "Lights Out for One Hour", is an initiative launched by the World Wildlife Fund to the world in 2007 : Calls on individuals, communities, businesses and governments to turn off lights for one hour between 20:30-21:30 on the last Saturday in March every year to inspire people's sense of responsibility for protecting the earth and thinking about environmental issues such as climate change. Support global collective action to combat climate warming.

This is a global event. After the WWF first launched it in Sydney in 2007, it swept the world at an alarming rate, and everyone came to participate in this event. The "Earth Hour" event was first launched in Sydney, Australia on March 31, 2007, attracting more than 2.2 million Sydney families and businesses to participate; subsequently, the event quickly swept the world at an alarming rate.