(阅读理解)The “Earth Hour” movement--- initiated by the World Wildlife Fund is set to be marked around the world. In an effort to bring attention to global climate change, the group is calling for lights to be turned off across the globe between 8:30 p.m. and 9:30 p.m. on Saturday.　　　　　　　　　　　　　　　　Some of the most famous places in China will join “Earth Hour”. The Bird’s Nest and the Water Cube in Beijing and the Oriental Pearl Broadcasting Tower in Shanghai will switch off their lights for one hour on Saturday evening. Citizens, communities, and companies around the country are doing their part to organize and promote the movement.　　　　　　　　　　　　　　　　So far, more than 2,400 cities from 81 countries and 1 billion people from around the world have joined “Earth Hour”. UN Secretary General Ban-Ki-moon is urging more people to participate and make some contribution to the efforts against global warming. 　　　　　　　　　　　　　　　　“Earth Hour” began in Sydney in 2007. In 3 years, it has grown into one of the world’s largest joint actions dealing with climate change.　　　　　　　　　　　　　　　　On March 31, 2007, over 2.2 million homes and businesses in Sydney switched off their lights for one hour. It was estimated that electricity saved during that hour could sustain 200,000 TV sets for one hour.　　　　　　　　　　　　　　　　As an added reward, Sydney residents joining the movement said they could see more stars than ever during that night. After that, “Earth Hour” spread around the world at an amazing speed. In 2008, from Oceania to Asia, from Europe to America, 50 million people switched off their lights. More and more people have been joining the “Earth Hour” movement and contributing in their own way to save our planet.　　　　　　　　　　　　　　　　（question）65. What is the aim of the “Earth Hour” movement?