Over 180 countries, 7,000 cities and 2 billion people came together to mark Earth Hour 2017—a decade-old annual event held by the World Wildlife Fund (WWF). For one hour at precisely the same time, participants turn off all electrical appliances and lights. Traditionally, the world’s most recognizable buildings and monuments —the Sydney Opera House, the Acropolis in Athens, the Eiffel Tower in Paris, the Colosseum in Rome—also descend into voluntary darkness. The event took place on March 25, 2017, under the slogan, “Change yourself, not the planet.” The point is not to save electricity for an hour, but to draw attention to environmental problems, notes the WWF. This year, Russia set a record for the number of participating cities—150 in total. For unlit, yet still spectacular views of Moscow’s Kremlin, Kazan’s Kul-Sharif Mosque and St. Petersburg’s Winter Palace, go to the RBTH video.
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