Earth Hour, run by WWF, the world's leading conservation organisation, is a global initiative which calls on individuals and businesses around the world to turn off their lights for one hour on the last Saturday of March every year. This year is the fourth year since the program launched whilst Hong Kong participated for the second time this year. The aim of the campaign is to show that small changes can make a real difference in building a sustainable future.  In support of the campaign, staff of TUNBOW Group dressed black on Mar 26, the day before Earth Hour.  Staff avoids printing to save paper and electricity.  The Group also encourages its staff to support the campaign on Mar 27 with relatives and friends.