Earth گھنٹہ 2008 

On March 29 at 8 pm local time, residents and businesses around the world will turn off their lights for one گھنٹہ to deliver a powerful message about the need for action on global warming. It started in Sydney, Australia. It continues in your city!
الفاظ مطلوبہ: energy, conserve, earth گھنٹہ