The Petronas Towers are seen before Earth Hour in Kuala Lumpur, Malaysia, on March 25, 2017. (Xinhua/Chong Voon Chung) 
Lights of Petronas Towers are switched off during Earth Hour in Kuala Lumpur, Malaysia, on March 25, 2017. (Xinhua/Chong Voon Chung) 
A light installation of the "i Light Marina Bay" is switched off during Earth Hour in Singapore's Marina Bay on March 25, 2017. (Xinhua/Then Chih Wey) 
A light installation of the "i Light Marina Bay" is switched off during Earth Hour in Singapore's Marina Bay on March 25, 2017. (Xinhua/Then Chih Wey) 
Combo photo taken on March 25, 2017 shows the Brandenburg Gate with lights on (above) and off for the annual Earth Hour event in Berlin, capital of Germany. (Xinhua/Shan Yuqi) 
Volunteers of the World Wildlife Fund (WWF) place candles to form the words "EARTH HOUR" for the annual Earth Hour event in Berlin, capital of Germany, on March 25, 2017. (Xinhua/Shan Yuqi) 
Photo taken on March 25, 2017 shows lights with words "Earth Hour" placed on the ground for the annual Earth Hour event in Berlin, capital of Germany. (Xinhua/Shan Yuqi) 
People gather around a torch on Red Square with lights off during the Earth Hour campaign in Moscow, capital of Russia, on March 25, 2017. (Xinhua/Evgeny Sinitsyn) 
Activists of the World Wildlife Fund (WWF) take a selfie with St. Basil's Cathedral on Red Square during the Earth Hour campaign in Moscow, capital of Russia, on March 25, 2017. (Xinhua/Evgeny Sinitsyn) 
Combo photo taken on March 25, 2017 shows Kremlin with lights off (above) and on during the Earth Hour campaign in Moscow, capital of Russia, on March 25, 2017. (Xinhua/Evgeny Sinitsyn) 
Combo photo taken on March 25, 2017 shows St. Basil's Cathedral and Kremlin with lights off (above) and on during the Earth Hour campaign in Moscow, capital of Russia, on March 25, 2017. (Xinhua/Evgeny Sinitsyn) 
Combo photo taken on March 25, 2017 shows GUM (known as State Department Store) on Red Square with lights off (above) and on during the Earth Hour campaign in Moscow, capital of Russia, on March 25, 2017. (Xinhua/Evgeny Sinitsyn) 
Egyptian people attend an awareness campaign on the occasion of Earth Hour at the National Museum of Egyptian Civilization in Cairo, capital of Egypt, on March 25, 2017. (Xinhua/Ahmed Gomaa) 
Egyptian people attend an awareness campaign on the occasion of Earth Hour at the National Museum of Egyptian Civilization in Cairo, capital of Egypt, on March 25, 2017. (Xinhua/Ahmed Gomaa) 
Egyptian people attend an awareness campaign on the occasion of Earth Hour at the National Museum of Egyptian Civilization in Cairo, capital of Egypt, on March 25, 2017. (Xinhua/Ahmed Gomaa) |
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