Earth Hour: 4 things to know about the annual evironmental event

[news]

http://i.cbc.ca/1.2591842.1396188465!/fileImage/httpImage/image.jpg_gen/derivatives/16x9_460/earth-hour-canada.jpg Millions of homes and businesses around the world will be in the dark tonight during Earth Hour, an annual event aimed at raising awareness about climate change and the environment.


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