(230325) -- SYDNEY, March 25, 2023 (Xinhua) -- The Sydney Opera House goes dark during the Earth Hour event in Sydney, Australia, March 25, 2023. Australia's landmarks, including the Sydney Opera House and Sydney Harbor Bridge, went dark for one hour on Saturday night as part of a global movement to raise awareness about climate change and nature loss. Earth Hour 2023 aims to raise awareness of the importance of trees and nature to wildlife, communities, and people's mental and physical well-being. (Photo by Hu Jingchen/Xinhua)