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STORY: EARTH HOUR DATELINE: Mar. 26, 2011 LENGTH: 0:02:22 LOCATION: Hong Kong INTRO People across the globe once again embraced darkness for an hour on 8:30 pm local time on Saturday, following the call to build a low-carbon, more environment-friendly world. World News takes a look. The annual event, which falls on the last Saturday of each March, has become increasingly popular since it was first observed in 2007. Sydney is one of the first cities in the world to turn off the light on Saturday. At 8:30 pm local time, lights on the Sydney Opera House, Harbour Bridge and in homes and business across the city were switched off. About 4,000 cities in more than 120 countries are expected to observe the earth hour this year. Many groups want to use the hour to pay tribute to Japan, which this month suffered a 9-magnitude earthquake and tsunami. Hong Kong went dim Saturday evening. Iconic landmarks turned dark. More than 3,100 companies and buildings took part. WWF-HONG KONG es Powered by Producer : Xinhua News Agency