National Earth Hour Day came about to bring attention to climate change. Earth Hour encourages participants to turn off all non-essential lights for one hour.
The event, which began in 2007 in Australia, is organized by World Wide Fund for Nature. It has become quite popular over the years and has spread to over 4000 cities around the world.
This year, Earth Hour will take place today, March 30, from 8:30pm until 9:30pm.
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