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Millions of people from more than 190 countries will have turned off the lights this Saturday to demand more action against the climate crisis in a new call for Earth Hour. It is a worldwide movement that achieves a massive citizen response by turning off the lights of the most emblematic homes, businesses, buildings and monuments. The movement was born 17 years ago in Sydney, Australia, and since then it has become the greatest symbol of the fight against climate change and the loss of biodiversity. What happened between 8:30 p.m. and 9:30 p.m.