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digg_title = 'Antarctica to Pyramids lights dim for Earth Hour (AP)';
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People wave their glow sticks after the switching off of lights as part of the worldwide movement dubbed as Earth Hour Saturday, March 28, 2009 in Manila, Philippines. The switching off of lights is a worldwide effort of people around the globe to take the seriousness of global warming. (AP Photo/Pat Roque)
BONN, Germany - From an Antarctic research base to the Great Pyramids of Egypt and beyond, the world switched off the lights on Saturday for 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.
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.
An agreement to replace the Kyoto Protocol, which expires in 2012, is supposed to be reached in Copenhagen, Denmark, this December, and environmentalists' sense of urgency has spurred interest in this year's Earth Hour. Last year, only 400 cities participated; Sydney held a solo event in 2007.