Worldwide darkness planned for Earth Hour
What started in 2007 as one city's protest over inaction on climate change has ignited into a worldwide movement. On Saturday, 1,800 cities are expected to participate in this year's Earth Hour.
That evening, an anticipated one billion people will take part in a global "power down," by switching off lights and electronics from 8:30 to 9:30 p.m. in their local times.
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