Lights Go Dark for Earth Hour to Highlight Climate ChangeIn Paris, the Eiffel Tower went dark. In London, so did the Tower Bridge, Big Ben, Piccadilly Circus, the London Eye. \n\nThat scene was repeated over and over around the world Saturday night: at Sydney’s Opera House; at New Delhi’s great arch; at Kuala Lumpur’s Petronas Towers; at Edinburgh Castle in Scotland; at Brandenburg Gate in Berlin; at St. Basil’s Cathedral in Moscow. It lasted for an hour and its power is purely symbolic. But in countries around the world, at 8:30 p.m., people were switching off their lights for Earth Hour, a global call for international unity on the importance of addressing climate change. 'Universal message' Since beginning in Sydney in 2007, Earth Hour has spread to more than 180 countries, with tens of millions of people joining in, from turning off their own porch lights to letting the grand sites like the Opera House go dark. \n\nParis Mayor Anne Hidalgo said 300 Paris buildings observed the blackout to send a “universal message.”\n\nThose 60 minutes are “an opportunity” to shift “the consumption culture and behavior change toward sustainability,” Indian Environment Minister Harsh Vardhan said.\n\nAll this happens and yet many people, of course, barely notice. \n\nAround India Gate, New Delhi’s monument to the Indian dead in World War I, thousands embraced the city’s nightly warm-weather ritual Saturday. They bought ice cream and cheap plastic trinkets. They flirted. Young children rode in electric carts that their parents rented for a few minutes at a stretch. \n\nBut for an hour the arch stayed dark, a silent call for change. Guinness attempt\n\nIn Jordan, the Royal Society for the Conservation of Nature arranged 11,440 candles on a hilltop in the capital of Amman, establishing a Guinness World Record for the largest candle mosaic. \n\nThe candles spelled the Earth Hour motto of “60+.” However, attempts to light the candles largely failed because of wind on the hilltop, which is close to the city’s landmark, the Amman Citadel.