SPUTNIK / SCIENCE PHOTO LIBRARY SPUTNIK / SCIENCE PHOTO LIBRARY
Earth Hour in Moscow, Russia, 23rd March 2013. The Kremlin with and without lights as part of the Earth Hour environmental campaign, which raises awareness of energy use and climate change. Earth Hour is organised by the World Wide Fund for Nature. It is held annually, encouraging people to turn off non-essential lights between 8.30pm and 9.30pm on the last Saturday in March.
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