This Saturday night, millions of people around the world will turn off their lights to mark Earth Hour. The global event is now in its eight year, but how much do you know about the movement?
Test your Earth Hour knowledge with our quiz.
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Young women attend a candlelight vigil to observe Earth Hour in La Paz, Bolivia on March 29, 2014. (AP / Juan Karita)
This Saturday night, millions of people around the world will turn off their lights to mark Earth Hour. The global event is now in its eight year, but how much do you know about the movement?
Test your Earth Hour knowledge with our quiz.