The Earth Hour is an event that celebrates the land that needs a break, everyone turns off their lights for one hour to save energy.Once every year there is this event and many collaborating institutions can be made. Since power plants pollute the atmosphere, this is done to raise awareness and be more thrifty. The world's great cities such as''New York'',''London'',''Sydney'',''Madrid,''''Barcelona''... Turn off the lights of all public institutions and monuments that consume more energy, thanks to this time of the earth have saved 12% of global energy.
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