My flat went dark for one hour Saturday night !

New York City’s Empire State Building is scheduled to go dark for one hour Saturday night.  So are the St. Louis Gateway Arch, the Golden Gate Bridge, the Eiffel Tower, Egypt’s Great Pyramid of Giza and many other iconic structures. The lights will be going out for Earth Hour, organized by the World Wildlife Fund to draw attention to global warming, from 8:30 to 9:30 p.m. Saturday local time around the world. That’s when organizers of the event, which began in Sydney in 2007, want everyone to turn off non-essential lights. About 2,800 cities in 83 countries — including 250 in the United States — had signed up, according to Dan Forman, a spokesman for World Wildlife Fund, an international conservation organization that boasts 1.2 million national members and close to 5 million globally… on