World landmarks dimmed for Earth Hour
APTOPIX Pakistan Earth Hour
Pakistani children light candles during a ceremony to mark Earth Hour in Islamabad, Pakistan, on Saturday, March 31, 2012. Earth Hour takes place worldwide at 8.30 p.m. local times and is a global call to turn off lights for 60 minutes in a bid to highlight the global climate change. (AP Photo/Anjum Naveed)






