Globe goes dark for Earth Hour

A combination picture shows the entrance to the Sydney amusement park "Luna Park" on March 21, 2013 (top) before Earth Hour, and during Earth Hour March 23, 2013. Earth Hour, when everyone around the world is asked to turn off lights for an hour from 8.30 pm local time, is meant as a show of support for tougher action to confront climate change. [Photo/Agencies]