Antarctica to Pyramids : lights dim for Earth Hour

From an Antarctic research base and the Great Pyramids of Egypt to the Empire State Building in New York, illuminated patches of the globe went dark Saturday for Earth Hour, a campaign to highlight the threat of climate change.

Time zone by time zone, nearly 4,000 cities and towns in 88 countries joined the event sponsored by the World Wildlife Fund to dim nonessential lights from 8:30 p.m. to 9:30 p.m. The campaign began in Australia in 2007 and last year grew to 400 cities worldwide.

Organizers initially worried enthusiasm this year would wane with the world focused on the global economic crisis, said Earth Hour executive director Andy Ridley. But he said it apparently had the opposite effect.

A combination photo of a night view of the site of the ancient Giza Pyramids before and after switching off the lights for the Earth Hour, in Cairo, Egypt Saturday March 28, 2009. From an Antarctic research base to the Great Pyramids of Egypt and beyond, the world switched off the lights on Saturday for the second Earth Hour, dimming skyscrapers, city streets and some of the world's most recognizable monuments for 60 minutes to highlight the threat of climate change.

"Earth Hour has always been a positive campaign; it's always around street parties, not street protests, it's the idea of hope, not despair. And I think that's something that's been incredibly important this year because there is so much despair around," he said.

Crowds in Time Square watched as many of the massive billboards, including the majestic "Phantom of the Opera" marquee, darkened.

Officials planned to flip a 4-foot-tall, mock light switch in Chicago, one of 10 U.S. Earth Hour flagship cities, where a storm added rains and strong winds to the drama of the event. More than 200 buildings have pledged to go dark in the city, including shops along the Magnificent Mile. Workers will also pull the plug on the marquee at the Chicago Cubs' Wrigley Field.

In San Francisco, lights on landmarks like the Golden Gate Bridge were set to be turned off, along with the city's well-known Ghirardelli Square sign. The Las Vegas Strip will turn down its glitz by extinguishing the marquees and decorative lighting outside casinos, as well as the famous "Welcome to Fabulous Las Vegas" sign.

China participated for the first time, cutting the lights at Beijing's Bird's Nest Stadium and Water Cube, the most prominent 2008 Olympic venues. In Bangkok, the prime minister switched off the lights on Khao San Road, a haven for budget travelers packed with bars and outdoor cafes.

Earth Hour organizers say there's no uniform way to measure how much energy is saved worldwide.

Earth Hour 2009 has garnered support from global corporations, nonprofit groups, schools, scientists and celebrities — including Oscar-winning actress Cate Blanchett and retired Cape Town Archbishop Desmond Tutu.

McDonald's Corp. planned to dim its arches at 500 locations around the U.S. Midwest. The Marriott, Ritz-Carlton and Fairmont hotel chains and Coca-Cola Co. also planned to participate.