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my friend just ask me this question..and i am curious too..so i look it up..and i find it is saving coal and the natural gas which are used by more than 70% of the world .(and I understand how this helps to stop the global warming)but there are actually only 7.2%.who is using hydro to get electricity..(and apparently most regions of Canada esp.B.C are using hydro)..so how does this(like Earth hour, everyone shut down their light) help? so my question really is how dose saving electricity
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