Combo photo shows the Petronas Twin Towers and its nearby buildings before (top) and during Earth Hour in Kuala Lumpur, Malaysia on March 26, 2022. (Photo by Chong Voon Chung/Xinhua)

Combo photo shows the Petronas Twin Towers and its nearby buildings before (top) and during Earth Hour in Kuala Lumpur, Malaysia on March 26, 2022. (Photo by Chong Voon Chung/Xinhua)

Combo photo shows the Petronas Twin Towers and its nearby buildings before (top) and during Earth Hour in Kuala Lumpur, Malaysia on March 26, 2022. (Photo by Chong Voon Chung/Xinhua)

Combo photo shows the Saladin Citadel (rear) before (top) and during the Earth Hour in Cairo, Egypt, on March 26, 2022. Egypt marked the annual global on Saturday evening by turning off the lights of a number of landmarks across the country for 60 minutes, including Saladin Citadel in the capital Cairo. (Xinhua/Ahmed Gomaa)

Combo photo shows the Egyptian Ministry of Foreign Affairs building (C) before (top) and during the Earth Hour in Cairo, Egypt, on March 26, 2022. Egypt marked the annual global Earth Hour on Saturday evening by turning off the lights of a number of landmarks across the country for 60 minutes, including Saladin Citadel in the capital Cairo. (Xinhua/Ahmed Gomaa)

Environmental advocates hold a program at Rizal Park during the annual Earth Hour in Manila, the Philippines on March 26, 2022. (Xinhua/Rouelle Umali)

Environmental advocates and bicycle enthusiasts are seen at Rizal Park during the annual Earth Hour in Manila, the Philippines on March 26, 2022. (Xinhua/Rouelle Umali)

The Romanian Athenaeum concert hall is seen without lights on the facade during the Earth Hour in Bucharest, Romania, on March 26, 2022. (Photo by Cristian Cristel/Xinhua)

The Romanian Parliament building is seen without lights on the facade during the Earth Hour in Bucharest, Romania, on March 26, 2022. (Photo by Cristian Cristel/Xinhua)

Combo photo shows the Schonbrunn Palace before (top) and during the Earth Hour in Vienna, Austria, March 26, 2022. (Photo by Georges Schneider/Xinhua)

The Brussels Town Hall with lights off is seen during the Earth Hour event at the Grand Place in Brussels, Belgium, on March 26, 2022. (Xinhua/Zheng Huansong)

The Brussels Town Hall with lights off is seen during the Earth Hour event at the Grand Place in Brussels, Belgium, on March 26, 2022. (Xinhua/Zheng Huansong)

Combo photo shows the building of European Central Bank headquarters before (L) and after lights are dimmed during the Earth Hour event in Frankfurt, Germany, March 26, 2022. (Photo by Armando Babani/Xinhua)

Combo photo shows the finance and banking district before (top) and after lights are dimmed during the Earth Hour event in Frankfurt, Germany, March 26, 2022. (Photo by Armando Babani/Xinhua)

Combo photo shows buildings before (top) and during the Earth Hour in Singapore, March 26, 2022. (Photo by Then Chih Wey/Xinhua)

Combo photo shows the Tokyo Tower before (top) and during the Earth Hour in Tokyo, Japan, March 26, 2022. (Xinhua/Zhang Xiaoyu)

Combo photo shows the Tokyo Station before (top) and during the Earth Hour in Tokyo, Japan, March 26, 2022. (Photo by Sun Jialin/Xinhua)

Combo photo shows the Petronas Twin Towers and its nearby buildings before (top) and during Earth Hour in Kuala Lumpur, Malaysia on March 26, 2022. (Photo by Chong Voon Chung/Xinhua)