Turn out your light, show support In 2009 hundreds of millions of people around the world showed their support by turning off their lights for one hour. Earth Hour 2010 will continue to be a global call to action to every individual, every business and every community. A call to stand up, to show leadership and be responsible for our future. Pledge your support here and turn off your lights for one hour, Earth Hour, 8.30pm, Saturday 27th March 2010. It’s Showtime! Show what can be done.