From Rome's Colosseum to the Sydney Opera House to the Sears Tower's famous antennas in Chicago, floodlit icons of civilization have gone dark for Earth Hour, a worldwide campaign to highlight the waste of electricity and the threat of climate change.
The environmental group WWF has urged governments, businesses and households to turn back to candle power for at least 60 minutes Saturday starting at 8 p.m. wherever they were.
The campaign began last year in Australia and traveled this year from the South Pacific to Europe in cadence with the setting of the sun. 
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