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Darkness sweeps the globe during Earth Hour

Cities across the world went dark Saturday night for Earth Hour, a global "lights-off" campaign to highlight the threat of climate change, the Associated Press reported.

The event, hosted by the environmental group WWF, entailed turning off the lights for at least an hour starting at 8 p.m. in every time zone.

Earth Hour started last year in Australia and trailed the setting sun to Europe and some American cities.

Event organizers hoped 100 million people would observe Earth Hour, cutting down on electricity use.

Last year, the event cut 10.2 percent of Australia's carbon emissions for that hour.

The Star Tribune did not publish any information on whether the event would be observed locally.