Earth Hour is an event that encourages people around the world to switch off electricity at the same time for one hour. Of course, switching off the lights for an hour makes a small difference to the amount of energy we use. But the aim of the event is not to save energy but to get people to think about the planet they live on. Earth Hour started in Australia in 2007. More and more countries join the ecological movement every year. Now, millions of people from 178 countries switch off their lights for 60 minutes at the end of March. People in Russia participate in this event too – large office buildings and small private houses go dark for Earth Hour.