WWF’s Earth Hour is a unique annual phenomenon that focuses the world’s attention on our amazing planet, and how we need to protect it. Earth Hour is a simple idea gone global. Show your support and switch off! WWF is calling for people across the world to take part in Earth Hour 2013 – the biggest switch-off in history. At 8:30pm on 23rd March hundreds of millions of people across the globe are expected to turn off their lights for an hour, to show they care about the future of our planet. Last year’s Earth Hour saw a staggering 6,950 towns and cities in more than 152 countries take part in what has become a global movement. From a single domestic light bulb to giant iconic illuminations such as Big Ben, the Taj Mahal and the Sydney Opera House, the Earth Hour switch-off can demonstrate a determination to help protect the planet.