Google also took part in supporting the Earth Hour 2008. From 12.00am on 29th March 2008 until the end of Earth Hour, the Google homepage in most countries was turned to a black background. Their tagline at that time was "We've turned the lights out. Now it's your turn - Earth Hour".
Earth Hour is an annual international event created by the WWF, celebrated on the last Saturday of March. On that day, people around the world are asked to turn off their lights for one hour. It is held to raise awareness towards the need to take action on climate change especially global warming.
