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WWF | EARTH HOUR | 2007

In Just One Hour, They Proved They Could Move the World / WWF "EARTH HOUR"

On March 31, 2007, 2.2 million people in Sydney switched off their lights all at once — a way of showing that they were serious about climate change, at a time when skepticism still hung in the air. This single hour of action has since spread around the world, 20 years on.