PARIS, March 19, 2016 (Xinhua) -- Combined photo taken on March 19, 2016 shows the Eiffel Tower before (R) and after (L) turning off lights for the annual Earth Hour event in Paris, France, March 19, 2016. (Xinhua/Vincent Isore)
DOHA, March 19, 2016 (Xinhua) -- People light up candles on an earth-shaped cake as to signal the Earth Hour campaign at a hotel in Doha, capital of Qatar, March 19, 2016. (Xinhua/Meng Tao)
ROME, March 19, 2016 (Xinhua) -- Combined photo shows the Trevi Fountain before (T) and after (B) turning off the lights for the annual Earth Hour event in Rome, Italy, March 19, 2016. (Xinhua/Jin Yu)
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