BBC: Hours later, Beijing’s most prominent Olympic venues, the Bird’s Nest and Water Cube, went dark. China is taking part for the first time, with major cities like Hong Kong, Shanghai and Guangzhou also dimming their lights. Other locations due to take part this time include Edinburgh Castle in Scotland, St Peter’s Basilica in Rome, Paris’ Eiffel Tower, the Egyptian Pyramids and New York’s Empire State Building. Fast-food giant McDonald’s has pledged to dim its “golden arches” at …