Earth Hour 2012
People use candles to create the number 60, representing the minutes in an hour, as they mark Earth Hour in La Paz, Bolivia, Saturday March 31, 2012. Earth Hour takes place worldwide at 8:30 p.m. local time and is a global call to turn off lights for 60 minutes, as a symbolic act to raise awareness about climate change and to make people aware of everyday energy use.
Credit: AP Photo/Juan Karita