SYDNEY, AUSTRALIA - MARCH 29: This combination photograph shows the Kings Cross Coca Cola sign illuminated after Earth Hour (top) and turned off during Earth Hour March 29, 2008 in Sydney, Australia. The entire city of Sydney, including companies, government departments, individuals and families have been urged to switch off their lights for one hour at 8.00pm. The event was launched in 2007 by WWF (World Wide Fund for Nature) in Australia and is designed to create awareness and reduce greenhouse gas emissions.